Fix cross build with mingw32
At least on Ubuntu 20.04 the x86_64-w64-mingw32-gcc toolchain defaults to WinXP. We require at least Vista for FILE_STANDARD_INFO.
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At least on Ubuntu 20.04 the x86_64-w64-mingw32-gcc toolchain defaults to WinXP. We require at least Vista for FILE_STANDARD_INFO.