Remove UWP stuff that is no longer supported

sokol_app.h

@@ -2003,14 +2003,6 @@ inline void sapp_run(const sapp_desc& desc) { return sapp_run(&desc); }
 
 #endif
 
-// this WinRT specific hack is required when wWinMain is in a static library
-#if defined(_MSC_VER) && defined(UNICODE)
-#include <winapifamily.h>
-#if defined(WINAPI_FAMILY_PARTITION) && !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
-#pragma comment(linker, "/include:wWinMain")
-#endif
-#endif
-
 #endif // SOKOL_APP_INCLUDED
 
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