Support Windows.Clang.toolchain.cmake and Windows.Kits.cmake consumption from Linux#153
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#148 floated the idea of support for cross-compiling for Windows from Linux using the Windows.Clang.toolchain.cmake. After a few fixes - #149, #151, #152 - this PR sketches the approach.
VS_INSTALLATION_PATHvariable needs to be set. This PR adds support when building on WSL to obtain theVS_INSTALLATION_PATHvalue usingvswhere.exeon Windows.CMAKE_WINDOWS_KITS_10_DIRvariable needs to be set. This PR adds support when building on WSL to calculateCMAKE_WINDOWS_KITS_10_DIRby reading from the Windows OS registry.CMAKE_SYSTEM_PROCESSORneed to be accommodated when calculatingCMAKE_VS_PLATFORM_TOOLSET_ARCHITECTUREandWINDOWS_KITS_TARGET_ARCHITECTURE.This PR adds CMake presets showing cross-compilation from Linux for arm64 and x64, using clang-20 on WSL - leveraging the toolchain support for discovering a VS installation, and a Windows SDK.