clock_gettime.c: Use __APPLE__ instead of __MACH__
Hurd also defines __MACH__, but it does not have mach_absolute_time. Use the more strict __APPLE__ instead. Has also been sent upstream: https://github.com/libcheck/check/pull/65
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Hurd also defines __MACH__, but it does not have mach_absolute_time. Use the more strict __APPLE__ instead. Has also been sent upstream: https://github.com/libcheck/check/pull/65