WIP: GRDK (Gaming.Desktop.x64)

[jpnurmi]

A quick experiment to see what happens with:

• https://github.com/microsoft/GDK
• https://github.com/microsoft/Xbox-GDK-Samples/blob/main/Samples/Tools/CMakeGDKExample/grdk_toolchain.cmake

TODO: non-win32 build to emulate Xbox

#skip-changelog for now

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.49%. Comparing base (fef7868) to head (adb69c2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1311      +/-   ##
==========================================
+ Coverage   83.39%   83.49%   +0.09%     
==========================================
  Files          54       54              
  Lines        8153     8153              
  Branches     1241     1241              
==========================================
+ Hits         6799     6807       +8     
+ Misses       1236     1229       -7     
+ Partials      118      117       -1     

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