Enable D3D12 detection when using mingw-64

x11: revert checks for _NET_WM_STATE_FULLSCREEN changes.

This reverts commit 8597735.
This reverts commit 0249df9.

Fixes libsdl-org#5572.
Reopens libsdl-org#5390.

Fixed logical size synchronization issue on macOS

https://discourse.libsdl.org/t/sdl-2-0-22-prerelease/35306/6

Handle potential out of memory condition when working with hints

Update version to 2.0.22 for release

Sync wiki -> header

Aded a patch note for relative mouse mode over RDP

audio: Fix false positives in driver name comparison

Without this change, driver names don't get matched correctly;
for example "a" can get matched with "alsa" since it only checks
whether the string matches up to the length of the requested
driver name.

Fixed whitespace

Backed out changeset 51622f74dc85