Set WinSDK version from WindowsSDKVersion for MSVC (#3925)
Set WinSDK version from WindowsSDKVersion for MSVC (#3925)

For the Visual Studio generater, set the WinSDK version to use the environment variable WindowsSDKVersion value, if set.  This is a workaround for a filed CMake bug:
https://gitlab.kitware.com/cmake/cmake/issues/17992.  See also https://stackoverflow.com/questions/45692367/how-to-set-msvc-target-platform-version-with-cmake

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