Some implibs contain code that indirectly includes winnt.h, which in
turn contains NtGetCurrentTeb. On arm64 that is implemented by reading
a global register variable. Gcc is perfectly fine with that, but clang
complains that x18 is not a reserved register on linux.
Signed-off-by: Sasha Finkelstein <fnkl.kernel(a)gmail.com>
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https://gitlab.winehq.org/wine/wine/-/merge_requests/8068