CMake: Enable WASAPI on WinRT #4273
                
     Merged
            
            
          
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Description
WASAPI backend on WinRT was implemented with 2.0.8
351d6d4
but CMake source here was written for 2.0.7 in vcpkg
microsoft/vcpkg@e6c65b9
This PR fixes WASAPI feature detection on WinRT + CMake and enables Audio in CMake generated SDL/WinRT library.