Aaron Ballman d7d743621a Reenable POSIX builtin library functions in gnu2x mode
gnu17 and earlier modes automatically expose several POSIX C APIs, and
this was accidentally disabled for gnu2x in
7d644e1215b376ec5e915df9ea2eeb56e2d94626.

This restores the behavior for gnu2x mode (without changing the
behavior in C standards modes instead of GNU modes).

Fixes #56607
2022-11-02 08:00:25 -04:00
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