contrib: harfbuzz: Skip using the _BitScan intrinsics on mingw
In mingw targets, both when using GCC and Clang, the __GNUC__ intrinsics right above can be used in most cases anyway. This fixes building with mingw-w64 for armv7/aarch64, which doesn't implement the _BitScanForward/_BitScanReverse intrinsics yet. Not upstreaming this fix yet since the correct fix would be to implement these intrinsics in mingw-w64 for armv7 and aarch64 as well.
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