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Define _LIBCPP_HAS_TIMESPEC_GET for FreeBSD when appropriate
Summary:
FreeBSD got `timespec_get` support somewhere in the 12.x timeframe, but
the C++ version check in its system headers was written incorrectly.
This has now been fixed for both FreeBSD 13 and 12.
Add checks for the corresponding `__FreeBSD_version` values, to define
`_LIBCPP_HAS_TIMESPEC_GET` when the function is supported.
Reviewers: emaste, EricWF, ldionne, mclow.lists
Reviewed By: ldionne
Subscribers: arichardson, krytarowski, christof, dexonsmith, libcxx-commits
Tags: #libc
Differential Revision: https://reviews.llvm.org/D71522