[PATCH v2] configure: Avoid clobbering x18 on arm64 when building with clang

[Alexandre Julliard]

Martin Storsjo <martin at martin.st> writes:

> On aarch64/arm64, clang/LLVM feels free to use x18 for normal code
> generation on linux (while the register is reserved on iOS/darwin).
> For windows/arm64, this register must not be clobbered.

This would have to be made the default system-wide, fixing it on the
Wine side isn't good enough since we call system libraries.

-- 
Alexandre Julliard
julliard at winehq.org