… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

cd95c9d subprocess: check and handle fcntl(F_GETFD) failure (Tomás Andróil)
b7288de subprocess: Proper implementation of wait() on Windows (Haowen Liu)
7423214 subprocess: Do not escape double quotes for command line arguments on Windows (Hennadii Stepanov)
bb9ffea subprocess: Explicitly define move constructor of Streams class (Shunsuke Shimizu)
174bd43 subprocess: Avoid leaking POSIX name aliases beyond `subprocess.h` (Hennadii Stepanov)
7997b76 subprocess: Fix cross-compiling with mingw toolchain (Hennadii Stepanov)
6476304 subprocess: Get Windows return code in wait() (Haowen Liu)
d3f511b subprocess: Fix string_arg when used with rref (Haowen Liu)
2fd3f2f subprocess: Fix memory leaks (Haoran Peng)

Pull request description:

  Most of these changes were developed during work on #29868 and #32342 and have since been upstreamed.

  As they are now merged, this PR backports them to our `src/util/subprocess.h` header.

  Required for #29868.

  A list of the backported PRs:
   - arun11299/cpp-subprocess#106
  - arun11299/cpp-subprocess#110
  - arun11299/cpp-subprocess#109
  - arun11299/cpp-subprocess#99
  - arun11299/cpp-subprocess#112
  - arun11299/cpp-subprocess#107
  - arun11299/cpp-subprocess#113
  - arun11299/cpp-subprocess#116
  - arun11299/cpp-subprocess#117

  The following PRs were skipped for backporting:
  - arun11299/cpp-subprocess#108 because we are not planning to support this feature.
  - arun11299/cpp-subprocess#101 because that change has been already landed in #29849.

ACKs for top commit:
  theStack:
    Light ACK cd95c9d
  laanwj:
    Code review re-ACK cd95c9d

Tree-SHA512: f9b60b932957d2e1cad1d87f2ad8bb68c97136e9735eb78547018a42cc50c4652750367f29462eadb0512c27db1dd8a7d4b17a2f0aeab62b3dbf86db5f51a61c

… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

… Windows

* refactor: Guard `util::quote_argument()` with `#ifdef __USING_WINDOWS__`

The `util::quote_argument()` function is specific to Windows and is used
in code already guarded by `#ifdef __USING_WINDOWS__`.

* Do not escape double quotes for command line arguments on Windows

This change fixes the handling of double quotes and aligns the behavior
with Python's `Popen` class. For example:
```
>py -3
>>> import subprocess
>>> p = subprocess.Popen("cmd.exe /c dir \"C:\\Program Files\"", stdout=subprocess.PIPE, text=True)
>>> print(f"Captured stdout:\n{stdout}")
```

Currently, the same command line processed by the `quote_argument()`
function looks like `cmd.exe /c dir "\"C:\Program" "Files\""`, which is
broken.

With this change, it looks correct: `cmd.exe /c dir "C:\Program Files"`.

Github-Pull: arun11299/cpp-subprocess#113
Rebased-From: ed313971c04ac10dc006104aba07d016ffc6542a

Github-Pull: bitcoin#32358
Rebased-From: 7423214