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557ea4614e
Original behaviour would unconditionally enable WinRT for all projects so source file flag generation code can acknowledge WinRT being present and disable it for C language source files. An unintentional result of that approach is that WinRT is enabled for ALL projects, including C++ projects/source files with no way to disable it Instead use `CMAKE_VS_WINRT_BY_DEFAULT` as a hint that the platform is WinRT-by-default and set global `CompileAsWinRT` flag to `false` unless it was explicitly requested by either `WINRT_COMPONENT` option or `/ZW` compilation option - similar to what Windows Phone/Windows Store platform logic does In case WinRT compilation is enabled for a project by either of aforementioned methods, C language source file override logic will still kick in and disable CompileAsWinRT for C source files Fixes: #20063