674c070 [Qt] seed OpenSSL PNRG with Windows event data (Philip Kaufmann)

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [bitcoin#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

cc3b528 gui: remove OpenSSL PRNG seeding (Windows, Qt only) (fanquake)

Pull request description:

  This removes the code introduced in [#4399](#4399) that attempts to add additional entroy to the OpenSSL PRNG using `RAND_event()`. This is specific to bitcoin-qt running on Windows.

  ```
  RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
  It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
  It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
  The program can then process the messages as usual.
  ```

  Besides BIP70, this is the last place we are directly using OpenSSL in the GUI code. All other OpenSSL usage is in [random.cpp](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp).

  Note that we are still also still doing other Windows specific gathering using [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268) and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600) on top of the other generation we do.

  Also note that if RAND_event returns `0` here (PRNG has **NOT** been seeded with enough data), we're just logging a single message and continuing, which also seems less than ideal.

ACKs for top commit:
  laanwj:
    ACK cc3b528
  MarcoFalke:
    unsigned ACK cc3b528
  theuni:
    ACK cc3b528.

Tree-SHA512: 0bb18779cf37f6670e3e5ac6a6a38e5f95199491b2684f9e56391c76f030fe1621d6df064239c2a398f228129fdf3f2220fc8cd15b2b92ecf2ea6d98a79b2175

cc3b528 gui: remove OpenSSL PRNG seeding (Windows, Qt only) (fanquake)

Pull request description:

  This removes the code introduced in [bitcoin#4399](bitcoin#4399) that attempts to add additional entroy to the OpenSSL PRNG using `RAND_event()`. This is specific to bitcoin-qt running on Windows.

  ```
  RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
  It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
  It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
  The program can then process the messages as usual.
  ```

  Besides BIP70, this is the last place we are directly using OpenSSL in the GUI code. All other OpenSSL usage is in [random.cpp](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp).

  Note that we are still also still doing other Windows specific gathering using [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268) and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600) on top of the other generation we do.

  Also note that if RAND_event returns `0` here (PRNG has **NOT** been seeded with enough data), we're just logging a single message and continuing, which also seems less than ideal.

ACKs for top commit:
  laanwj:
    ACK cc3b528
  MarcoFalke:
    unsigned ACK cc3b528
  theuni:
    ACK cc3b528.

Tree-SHA512: 0bb18779cf37f6670e3e5ac6a6a38e5f95199491b2684f9e56391c76f030fe1621d6df064239c2a398f228129fdf3f2220fc8cd15b2b92ecf2ea6d98a79b2175

Summary:
```
This removes the code introduced in
[#4399](bitcoin/bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows
messages.
Note that this is specific to bitcoin-qt running on Windows.

RAND_event() collects the entropy from Windows events such as mouse
movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all
messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any),
and add it to the PRNG.
The program can then process the messages as usual.

Besides BIP70, this is the last place we are directly using OpenSSL in
the GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in
multiple other places. Such as
[RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with
enough data), we're just logging a message and continuing on, which
seems less than ideal.
```

Backport of core [[bitcoin/bitcoin#17151 | PR17151]].

Test Plan: Run the build-win64 CI build plan.

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6156

Summary:
```
This removes the code introduced in
[#4399](bitcoin/bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows
messages.
Note that this is specific to bitcoin-qt running on Windows.

RAND_event() collects the entropy from Windows events such as mouse
movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all
messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any),
and add it to the PRNG.
The program can then process the messages as usual.

Besides BIP70, this is the last place we are directly using OpenSSL in
the GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in
multiple other places. Such as
[RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with
enough data), we're just logging a message and continuing on, which
seems less than ideal.
```

Backport of core [[bitcoin/bitcoin#17151 | PR17151]].

Test Plan: Run the build-win64 CI build plan.

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6156

This removes the code introduced in [#4399](bitcoin/bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [dashpay#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.

This removes the code introduced in [dashpay#4399](bitcoin#4399)
that attempts to add additional entroy to the OpenSSL PRNG using Windows messages.
Note that this is specific to bitcoin-qt running on Windows.

```
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction.
It should be called with the iMsg, wParam and lParam arguments of all messages sent to the window procedure.
It will estimate the entropy contained in the event message (if any), and add it to the PRNG.
The program can then process the messages as usual.
```

Besides BIP70, this is the last place we are directly using OpenSSL in the
GUI code. All other OpenSSL usage is in random.cpp.

Note that we are still also doing Windows specific entropy gathering in multiple
other places. Such as [RandAddSeedPerfmon](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L268)
and [RAND_screen()](https://github.com/bitcoin/bitcoin/blob/master/src/random.cpp#L600).

Also note that if RAND_event returns 0 (PRNG has NOT been seeded with enough data), we're
just logging a message and continuing on, which seems less than ideal.