don't use clock_gettime fallback on modern macOS
Summary: There were two problems with the clock_gettime fallback logic on macOS. One is that it used undefined macros if AvailabilityMacros.h wasn't included. Another is that it compiled the fallback when the minimum iPhone OS version (as when building on macOS) was not set, and vice versa. Fix that. Differential Revision: D21757362 fbshipit-source-id: 99fd17260cb25ed07c39ba79466e835f08a1fc7c
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