Possible fix for non-MSVC windows compilers `_MSC_VER` is specific to MSVC, but there can be other compilers targeting windows. Hopefully they do define `_WIN32`, so let's use that. Refs: https://github.com/xkbcommon/libxkbcommon/issues/305 Signed-off-by: Ran Benita <ran@unusedvar.com>