[CMake][Fuchsia] Support for building with MSVC
This change adds the necessary flags for building the full Fuchsia toolchain on Windows with MSVC. Differential Revision: https://reviews.llvm.org/D73810
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This change adds the necessary flags for building the full Fuchsia toolchain on Windows with MSVC. Differential Revision: https://reviews.llvm.org/D73810