Boost conatiner_hash (included via functional -> multi_index) uses
std::unary_function, which was deprecated in C++11, and "removed" in
C++17. It's use causes wanrings with newer compilers, i.e GCC 12.1.

```bash
/bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
  131 |         struct hash_base : std::unary_function<T, std::size_t> {};
      |                                 ^~~~~~~~~~~~~~
In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                 from /usr/include/c++/12/memory:76,
                 from ./init.h:10,
                 from init.cpp:10:
/usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
  117 |     struct unary_function
```

Use the MACRO outlined in
boostorg/container_hash#22, to prevent it's
use.

BOOST_NO_CXX98_FUNCTION_BASE:
> The standard library no longer supports std::unary_function and std::binary_function.
> They were deprecated in C++11 and is removed from C++14.

See:
boostorg/config#430
https://en.cppreference.com/w/cpp/utility/functional/unary_function
https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html

Boost conatiner_hash (included via functional -> multi_index) uses
std::unary_function, which was deprecated in C++11, and "removed" in
C++17. It's use causes wanrings with newer compilers, i.e GCC 12.1.

```bash
/bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
  131 |         struct hash_base : std::unary_function<T, std::size_t> {};
      |                                 ^~~~~~~~~~~~~~
In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                 from /usr/include/c++/12/memory:76,
                 from ./init.h:10,
                 from init.cpp:10:
/usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
  117 |     struct unary_function
```

Use the MACRO outlined in
boostorg/container_hash#22, to prevent it's
use.

BOOST_NO_CXX98_FUNCTION_BASE:
> The standard library no longer supports std::unary_function and std::binary_function.
> They were deprecated in C++11 and is removed from C++14.

See:
boostorg/config#430
https://en.cppreference.com/w/cpp/utility/functional/unary_function
https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html

Boost conatiner_hash (included via functional -> multi_index) uses
std::unary_function, which was deprecated in C++11, and "removed" in
C++17. It's use causes wanrings with newer compilers, i.e GCC 12.1.

```bash
/bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
  131 |         struct hash_base : std::unary_function<T, std::size_t> {};
      |                                 ^~~~~~~~~~~~~~
In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                 from /usr/include/c++/12/memory:76,
                 from ./init.h:10,
                 from init.cpp:10:
/usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
  117 |     struct unary_function
```

Use the MACRO outlined in
boostorg/container_hash#22, to prevent it's
use.

BOOST_NO_CXX98_FUNCTION_BASE:
> The standard library no longer supports std::unary_function and std::binary_function.
> They were deprecated in C++11 and is removed from C++14.

See:
boostorg/config#430
https://en.cppreference.com/w/cpp/utility/functional/unary_function
https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html

Boost conatiner_hash (included via functional -> multi_index) uses
std::unary_function, which was deprecated in C++11, and "removed" in
C++17. It's use causes wanrings with newer compilers, i.e GCC 12.1.

```bash
/bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
  131 |         struct hash_base : std::unary_function<T, std::size_t> {};
      |                                 ^~~~~~~~~~~~~~
In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                 from /usr/include/c++/12/memory:76,
                 from ./init.h:10,
                 from init.cpp:10:
/usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
  117 |     struct unary_function
```

Use the MACRO outlined in
boostorg/container_hash#22, to prevent it's
use.

BOOST_NO_CXX98_FUNCTION_BASE:
> The standard library no longer supports std::unary_function and std::binary_function.
> They were deprecated in C++11 and is removed from C++14.

See:
boostorg/config#430
https://en.cppreference.com/w/cpp/utility/functional/unary_function
https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html

880d4aa build: use BOOST_NO_CXX98_FUNCTION_BASE to suppress warnings (fanquake)
1bdbbbd build: suppress array-bounds errors in libxkbcommon (fanquake)

Pull request description:

  2 changes to better support building with GCC 12, which out of the box, is currently broken if you want to build using depends.
  Prevent `-Warray-bounds` errors when building libxkbcommon. i.e:
  ```bash
  src/xkbcomp/ast-build.c:82:27: error: array subscript 'ExprDef[0]' is partly outside array bounds of 'unsigned char[32]' [-Werror=array-bounds]
     82 |     expr->expr.value_type = type;
        |     ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  src/xkbcomp/ast-build.c:75:21: note: object of size 32 allocated by 'malloc'
     75 |     ExprDef *expr = malloc(size);
        |                     ^~~~~~~~~~~~
  ```

  It might be the case that these would be fixed by updating the
  package, but that would also require installing new build tools (meson),
  as well as potentially more dependencies (wayland), and it'd need
  testing with Qt. For now, just turn the errors into wanrings.

  Define `BOOST_NO_CXX98_FUNCTION_BASE` to prevent GCC warning about the use of `std::unary_function`. i.e:
  ```bash
  /bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
  warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
    131 |         struct hash_base : std::unary_function<T, std::size_t> {};
        |                                 ^~~~~~~~~~~~~~
  In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                   from /usr/include/c++/12/memory:76,
                   from ./init.h:10,
                   from init.cpp:10:
  /usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
    117 |     struct unary_function
  ```

  Boost `container_hash` (included via functional -> multi_index) uses
  [`std::unary_function`, which was deprecated in C++11](https://en.cppreference.com/w/cpp/utility/functional/unary_function), and "removed" in
  C++17. It's use causes warnings with newer compilers, i.e GCC 12.1.

  Use the MACRO outlined in boostorg/container_hash#22, and added to Boost Config for GCC 12 in boostorg/config#430, to prevent it's use.

  [BOOST_NO_CXX98_FUNCTION_BASE](https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html):
  > The standard library no longer supports std::unary_function and std::binary_function.
  > They were deprecated in C++11 and is removed from C++14.

  Guix Build (x86_64):
  ```bash

  ```

  Guix Build (arm64):
  ```bash

  ```

ACKs for top commit:
  laanwj:
    Code review ACK 880d4aa

Tree-SHA512: 10c4679c3eb788e9279acc4960731c55ae1568bd3df525d3c46f97d8b0319e7d8450b1638b6777d98111b5991dba5c787e95d80b1ac932e0b4779d4b8e74875e

880d4aa build: use BOOST_NO_CXX98_FUNCTION_BASE to suppress warnings (fanquake)
1bdbbbd build: suppress array-bounds errors in libxkbcommon (fanquake)

Pull request description:

  2 changes to better support building with GCC 12, which out of the box, is currently broken if you want to build using depends.
  Prevent `-Warray-bounds` errors when building libxkbcommon. i.e:
  ```bash
  src/xkbcomp/ast-build.c:82:27: error: array subscript 'ExprDef[0]' is partly outside array bounds of 'unsigned char[32]' [-Werror=array-bounds]
     82 |     expr->expr.value_type = type;
        |     ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  src/xkbcomp/ast-build.c:75:21: note: object of size 32 allocated by 'malloc'
     75 |     ExprDef *expr = malloc(size);
        |                     ^~~~~~~~~~~~
  ```

  It might be the case that these would be fixed by updating the
  package, but that would also require installing new build tools (meson),
  as well as potentially more dependencies (wayland), and it'd need
  testing with Qt. For now, just turn the errors into wanrings.

  Define `BOOST_NO_CXX98_FUNCTION_BASE` to prevent GCC warning about the use of `std::unary_function`. i.e:
  ```bash
  /bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
  warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
    131 |         struct hash_base : std::unary_function<T, std::size_t> {};
        |                                 ^~~~~~~~~~~~~~
  In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                   from /usr/include/c++/12/memory:76,
                   from ./init.h:10,
                   from init.cpp:10:
  /usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
    117 |     struct unary_function
  ```

  Boost `container_hash` (included via functional -> multi_index) uses
  [`std::unary_function`, which was deprecated in C++11](https://en.cppreference.com/w/cpp/utility/functional/unary_function), and "removed" in
  C++17. It's use causes warnings with newer compilers, i.e GCC 12.1.

  Use the MACRO outlined in boostorg/container_hash#22, and added to Boost Config for GCC 12 in boostorg/config#430, to prevent it's use.

  [BOOST_NO_CXX98_FUNCTION_BASE](https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html):
  > The standard library no longer supports std::unary_function and std::binary_function.
  > They were deprecated in C++11 and is removed from C++14.

  Guix Build (x86_64):
  ```bash

  ```

  Guix Build (arm64):
  ```bash

  ```

ACKs for top commit:
  laanwj:
    Code review ACK 880d4aa

Tree-SHA512: 10c4679c3eb788e9279acc4960731c55ae1568bd3df525d3c46f97d8b0319e7d8450b1638b6777d98111b5991dba5c787e95d80b1ac932e0b4779d4b8e74875e

Boost conatiner_hash (included via functional -> multi_index) uses
std::unary_function, which was deprecated in C++11, and "removed" in
C++17. It's use causes wanrings with newer compilers, i.e GCC 12.1.

```bash
/bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
  131 |         struct hash_base : std::unary_function<T, std::size_t> {};
      |                                 ^~~~~~~~~~~~~~
In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                 from /usr/include/c++/12/memory:76,
                 from ./init.h:10,
                 from init.cpp:10:
/usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
  117 |     struct unary_function
```

Use the MACRO outlined in
boostorg/container_hash#22, to prevent it's
use.

BOOST_NO_CXX98_FUNCTION_BASE:
> The standard library no longer supports std::unary_function and std::binary_function.
> They were deprecated in C++11 and is removed from C++14.

See:
boostorg/config#430
https://en.cppreference.com/w/cpp/utility/functional/unary_function
https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html

880d4aa build: use BOOST_NO_CXX98_FUNCTION_BASE to suppress warnings (fanquake)
1bdbbbd build: suppress array-bounds errors in libxkbcommon (fanquake)

Pull request description:

  2 changes to better support building with GCC 12, which out of the box, is currently broken if you want to build using depends.
  Prevent `-Warray-bounds` errors when building libxkbcommon. i.e:
  ```bash
  src/xkbcomp/ast-build.c:82:27: error: array subscript 'ExprDef[0]' is partly outside array bounds of 'unsigned char[32]' [-Werror=array-bounds]
     82 |     expr->expr.value_type = type;
        |     ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  src/xkbcomp/ast-build.c:75:21: note: object of size 32 allocated by 'malloc'
     75 |     ExprDef *expr = malloc(size);
        |                     ^~~~~~~~~~~~
  ```

  It might be the case that these would be fixed by updating the
  package, but that would also require installing new build tools (meson),
  as well as potentially more dependencies (wayland), and it'd need
  testing with Qt. For now, just turn the errors into wanrings.

  Define `BOOST_NO_CXX98_FUNCTION_BASE` to prevent GCC warning about the use of `std::unary_function`. i.e:
  ```bash
  /bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
  warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
    131 |         struct hash_base : std::unary_function<T, std::size_t> {};
        |                                 ^~~~~~~~~~~~~~
  In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                   from /usr/include/c++/12/memory:76,
                   from ./init.h:10,
                   from init.cpp:10:
  /usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
    117 |     struct unary_function
  ```

  Boost `container_hash` (included via functional -> multi_index) uses
  [`std::unary_function`, which was deprecated in C++11](https://en.cppreference.com/w/cpp/utility/functional/unary_function), and "removed" in
  C++17. It's use causes warnings with newer compilers, i.e GCC 12.1.

  Use the MACRO outlined in boostorg/container_hash#22, and added to Boost Config for GCC 12 in boostorg/config#430, to prevent it's use.

  [BOOST_NO_CXX98_FUNCTION_BASE](https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html):
  > The standard library no longer supports std::unary_function and std::binary_function.
  > They were deprecated in C++11 and is removed from C++14.

  Guix Build (x86_64):
  ```bash

  ```

  Guix Build (arm64):
  ```bash

  ```

ACKs for top commit:
  laanwj:
    Code review ACK 880d4aa

Tree-SHA512: 10c4679c3eb788e9279acc4960731c55ae1568bd3df525d3c46f97d8b0319e7d8450b1638b6777d98111b5991dba5c787e95d80b1ac932e0b4779d4b8e74875e

880d4aa build: use BOOST_NO_CXX98_FUNCTION_BASE to suppress warnings (fanquake)
1bdbbbd build: suppress array-bounds errors in libxkbcommon (fanquake)

Pull request description:

  2 changes to better support building with GCC 12, which out of the box, is currently broken if you want to build using depends.
  Prevent `-Warray-bounds` errors when building libxkbcommon. i.e:
  ```bash
  src/xkbcomp/ast-build.c:82:27: error: array subscript 'ExprDef[0]' is partly outside array bounds of 'unsigned char[32]' [-Werror=array-bounds]
     82 |     expr->expr.value_type = type;
        |     ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  src/xkbcomp/ast-build.c:75:21: note: object of size 32 allocated by 'malloc'
     75 |     ExprDef *expr = malloc(size);
        |                     ^~~~~~~~~~~~
  ```

  It might be the case that these would be fixed by updating the
  package, but that would also require installing new build tools (meson),
  as well as potentially more dependencies (wayland), and it'd need
  testing with Qt. For now, just turn the errors into wanrings.

  Define `BOOST_NO_CXX98_FUNCTION_BASE` to prevent GCC warning about the use of `std::unary_function`. i.e:
  ```bash
  /bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
  warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
    131 |         struct hash_base : std::unary_function<T, std::size_t> {};
        |                                 ^~~~~~~~~~~~~~
  In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                   from /usr/include/c++/12/memory:76,
                   from ./init.h:10,
                   from init.cpp:10:
  /usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
    117 |     struct unary_function
  ```

  Boost `container_hash` (included via functional -> multi_index) uses
  [`std::unary_function`, which was deprecated in C++11](https://en.cppreference.com/w/cpp/utility/functional/unary_function), and "removed" in
  C++17. It's use causes warnings with newer compilers, i.e GCC 12.1.

  Use the MACRO outlined in boostorg/container_hash#22, and added to Boost Config for GCC 12 in boostorg/config#430, to prevent it's use.

  [BOOST_NO_CXX98_FUNCTION_BASE](https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html):
  > The standard library no longer supports std::unary_function and std::binary_function.
  > They were deprecated in C++11 and is removed from C++14.

  Guix Build (x86_64):
  ```bash

  ```

  Guix Build (arm64):
  ```bash

  ```

ACKs for top commit:
  laanwj:
    Code review ACK 880d4aa

Tree-SHA512: 10c4679c3eb788e9279acc4960731c55ae1568bd3df525d3c46f97d8b0319e7d8450b1638b6777d98111b5991dba5c787e95d80b1ac932e0b4779d4b8e74875e

…SE` macro redefinition

d4c59da build: Avoid `BOOST_NO_CXX98_FUNCTION_BASE` macro redefinition (Hennadii Stepanov)

Pull request description:

  With GCC 12 and Boost 1.81 (from depends) having multiple warnings:
  ```
  In file included from /home/hebasto/bitcoin/depends/x86_64-pc-linux-gnu/include/boost/config.hpp:48:
  /home/hebasto/bitcoin/depends/x86_64-pc-linux-gnu/include/boost/config/stdlib/libstdcpp3.hpp:397:9: warning: 'BOOST_NO_CXX98_FUNCTION_BASE' macro redefined [-Wmacro-redefined]
  #define BOOST_NO_CXX98_FUNCTION_BASE
          ^
  <command line>:8:9: note: previous definition is here
  #define BOOST_NO_CXX98_FUNCTION_BASE 1
          ^
  1 warning generated.
  ```

  This PR fixes those warnings.

  Defining of the `BOOST_NO_CXX98_FUNCTION_BASE` macro was introduced in bitcoin/bitcoin#25436, but since boostorg/config#430, it is required to check it before adding.

ACKs for top commit:
  fanquake:
    ACK d4c59da - it works now.

Tree-SHA512: 53b9ddcf8dad729638ed41251e30c80f2d7d1ae3ffe47466865834f1f10184fe0881abeb339b3e46c270c3eb11fb63d19ab12cc9461bf5c2be12b4763c1b1c34

…o redefinition

d4c59da build: Avoid `BOOST_NO_CXX98_FUNCTION_BASE` macro redefinition (Hennadii Stepanov)

Pull request description:

  With GCC 12 and Boost 1.81 (from depends) having multiple warnings:
  ```
  In file included from /home/hebasto/bitcoin/depends/x86_64-pc-linux-gnu/include/boost/config.hpp:48:
  /home/hebasto/bitcoin/depends/x86_64-pc-linux-gnu/include/boost/config/stdlib/libstdcpp3.hpp:397:9: warning: 'BOOST_NO_CXX98_FUNCTION_BASE' macro redefined [-Wmacro-redefined]
  #define BOOST_NO_CXX98_FUNCTION_BASE
          ^
  <command line>:8:9: note: previous definition is here
  #define BOOST_NO_CXX98_FUNCTION_BASE 1
          ^
  1 warning generated.
  ```

  This PR fixes those warnings.

  Defining of the `BOOST_NO_CXX98_FUNCTION_BASE` macro was introduced in bitcoin#25436, but since boostorg/config#430, it is required to check it before adding.

ACKs for top commit:
  fanquake:
    ACK d4c59da - it works now.

Tree-SHA512: 53b9ddcf8dad729638ed41251e30c80f2d7d1ae3ffe47466865834f1f10184fe0881abeb339b3e46c270c3eb11fb63d19ab12cc9461bf5c2be12b4763c1b1c34

880d4aa build: use BOOST_NO_CXX98_FUNCTION_BASE to suppress warnings (fanquake)
1bdbbbd build: suppress array-bounds errors in libxkbcommon (fanquake)

Pull request description:

  2 changes to better support building with GCC 12, which out of the box, is currently broken if you want to build using depends.
  Prevent `-Warray-bounds` errors when building libxkbcommon. i.e:
  ```bash
  src/xkbcomp/ast-build.c:82:27: error: array subscript 'ExprDef[0]' is partly outside array bounds of 'unsigned char[32]' [-Werror=array-bounds]
     82 |     expr->expr.value_type = type;
        |     ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  src/xkbcomp/ast-build.c:75:21: note: object of size 32 allocated by 'malloc'
     75 |     ExprDef *expr = malloc(size);
        |                     ^~~~~~~~~~~~
  ```

  It might be the case that these would be fixed by updating the
  package, but that would also require installing new build tools (meson),
  as well as potentially more dependencies (wayland), and it'd need
  testing with Qt. For now, just turn the errors into wanrings.

  Define `BOOST_NO_CXX98_FUNCTION_BASE` to prevent GCC warning about the use of `std::unary_function`. i.e:
  ```bash
  /bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
  warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
    131 |         struct hash_base : std::unary_function<T, std::size_t> {};
        |                                 ^~~~~~~~~~~~~~
  In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                   from /usr/include/c++/12/memory:76,
                   from ./init.h:10,
                   from init.cpp:10:
  /usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
    117 |     struct unary_function
  ```

  Boost `container_hash` (included via functional -> multi_index) uses
  [`std::unary_function`, which was deprecated in C++11](https://en.cppreference.com/w/cpp/utility/functional/unary_function), and "removed" in
  C++17. It's use causes warnings with newer compilers, i.e GCC 12.1.

  Use the MACRO outlined in boostorg/container_hash#22, and added to Boost Config for GCC 12 in boostorg/config#430, to prevent it's use.

  [BOOST_NO_CXX98_FUNCTION_BASE](https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html):
  > The standard library no longer supports std::unary_function and std::binary_function.
  > They were deprecated in C++11 and is removed from C++14.

  Guix Build (x86_64):
  ```bash

  ```

  Guix Build (arm64):
  ```bash

  ```

ACKs for top commit:
  laanwj:
    Code review ACK 880d4aa

Tree-SHA512: 10c4679c3eb788e9279acc4960731c55ae1568bd3df525d3c46f97d8b0319e7d8450b1638b6777d98111b5991dba5c787e95d80b1ac932e0b4779d4b8e74875e

880d4aa build: use BOOST_NO_CXX98_FUNCTION_BASE to suppress warnings (fanquake)
1bdbbbd build: suppress array-bounds errors in libxkbcommon (fanquake)

Pull request description:

  2 changes to better support building with GCC 12, which out of the box, is currently broken if you want to build using depends.
  Prevent `-Warray-bounds` errors when building libxkbcommon. i.e:
  ```bash
  src/xkbcomp/ast-build.c:82:27: error: array subscript 'ExprDef[0]' is partly outside array bounds of 'unsigned char[32]' [-Werror=array-bounds]
     82 |     expr->expr.value_type = type;
        |     ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
  src/xkbcomp/ast-build.c:75:21: note: object of size 32 allocated by 'malloc'
     75 |     ExprDef *expr = malloc(size);
        |                     ^~~~~~~~~~~~
  ```

  It might be the case that these would be fixed by updating the
  package, but that would also require installing new build tools (meson),
  as well as potentially more dependencies (wayland), and it'd need
  testing with Qt. For now, just turn the errors into wanrings.

  Define `BOOST_NO_CXX98_FUNCTION_BASE` to prevent GCC warning about the use of `std::unary_function`. i.e:
  ```bash
  /bitcoin/depends/aarch64-unknown-linux-gnu/include/boost/container_hash/hash.hpp:131:33:
  warning: 'template<class _Arg, class _Result> struct std::unary_function' is deprecated [-Wdeprecated-declarations]
    131 |         struct hash_base : std::unary_function<T, std::size_t> {};
        |                                 ^~~~~~~~~~~~~~
  In file included from /usr/include/c++/12/bits/unique_ptr.h:37,
                   from /usr/include/c++/12/memory:76,
                   from ./init.h:10,
                   from init.cpp:10:
  /usr/include/c++/12/bits/stl_function.h:117:12: note: declared here
    117 |     struct unary_function
  ```

  Boost `container_hash` (included via functional -> multi_index) uses
  [`std::unary_function`, which was deprecated in C++11](https://en.cppreference.com/w/cpp/utility/functional/unary_function), and "removed" in
  C++17. It's use causes warnings with newer compilers, i.e GCC 12.1.

  Use the MACRO outlined in boostorg/container_hash#22, and added to Boost Config for GCC 12 in boostorg/config#430, to prevent it's use.

  [BOOST_NO_CXX98_FUNCTION_BASE](https://www.boost.org/doc/libs/master/libs/config/doc/html/boost_config/boost_macro_reference.html):
  > The standard library no longer supports std::unary_function and std::binary_function.
  > They were deprecated in C++11 and is removed from C++14.

  Guix Build (x86_64):
  ```bash

  ```

  Guix Build (arm64):
  ```bash

  ```

ACKs for top commit:
  laanwj:
    Code review ACK 880d4aa

Tree-SHA512: 10c4679c3eb788e9279acc4960731c55ae1568bd3df525d3c46f97d8b0319e7d8450b1638b6777d98111b5991dba5c787e95d80b1ac932e0b4779d4b8e74875e

std::unary_function has been removed in C++17. Fix compilation with
clang and other compiles that enforce strict standard compliance by
exporting BOOST_NO_CXX98_FUNCTION_BASE,

boostorg/config#430

std::unary_function has been removed in C++17. Fix compilation with
clang and other compiles that enforce strict standard compliance by
exporting BOOST_NO_CXX98_FUNCTION_BASE,

boostorg/config#430

std::unary_function has been removed in C++17. Fix compilation with
clang and other compiles that enforce strict standard compliance by
exporting BOOST_NO_CXX98_FUNCTION_BASE,

boostorg/config#430