Refine check for `_LIBCPP_C_HAS_NO_GETS` on FreeBSD Summary: In D67316 we added `_LIBCPP_C_HAS_NO_GETS` to signal that the C library does not provide `gets()`, and added a test for FreeBSD 13 or higher, using the compiler-defined `__FreeBSD__` macro. Unfortunately this did not work that well for FreeBSD's own CI process, since the gcc compilers used for some architectures define `__FreeBSD__` to match the build host, not the target. Instead, we should use the `__FreeBSD_version` macro from the userland header `<osreldate.h>`, which is more fine-grained. See also <https://reviews.freebsd.org/D22034>. Reviewers: EricWF, mclow.lists, emaste, ldionne Reviewed By: emaste, ldionne Subscribers: dexonsmith, bsdjhb, krytarowski, christof, ldionne, libcxx-commits Differential Revision: https://reviews.llvm.org/D69174 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@375340 91177308-0d34-0410-b5e6-96231b3b80d8
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