Dimitry Andric bc053cafca Correctly check for C++17 and higher when declaring timespec_get()
Summary:
In rS338751, the check to declare `timespec_get()` for C++17 and higher
was incorrectly done against a `cplusplus` define, while it should have
been `__cplusplus`.

Fix this by using `__cplusplus`, and also bump `__FreeBSD_version` so it
becomes possible to correctly check for `timespec_get()` in upstream
libc++ headers.

Reviewed by:	brooks, emaste
MFC after:	3 days
Differential Revision: https://reviews.freebsd.org/D22735
2019-12-09 19:17:56 +00:00
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