[PATCH 0/1] MR7281: include: Prefer builtin atomics on x86 unless known broken.

[William Horvath (＠whrvt)]

Clang presents as GCC 4.2.1, so it was always using the fallbacks for
`InterlockedExchange{,Pointer}` on the non-PE side.

The fix for the GCC `__atomic_*` bug linked in the comment for the `__WINE_ATOMIC_*`
macros first appeared in GCC 8:
https://github.com/gcc-mirror/gcc/commit/d8c40eff56f69877b33c697ded756d50fde...