[CMake] Handle clang in MSVC mode in GetHostTriple (#116701) When configuring CMake with Clang in MSVC mode, Clang can either be invoked with the MSVC style driver (clang-cl) or the GNU style driver (clang). When using the MSVC style driver, CMake sets the CMake variable MSVC (which indicates the kind of command line interface), but when using the GNU style driver, this variable isn't set, while Clang still operates in MSVC mode. Even though CMake doesn't set the variable MSVC, it still does set CMAKE_C_COMPILER_ARCHITECTURE_ID, which it does set for MSVC and Clang in MSVC mode, but not for Clang in MinGW mode. For this configuration, use the MSVC style, CMAKE_C_COMPILER_ARCHITECTURE_ID based GetHostTriple implementation.
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