Augustin Cavalier 330794a1f5 headers: Change most remaining include guards to _DEFAULT_SOURCE.
We automatically enable _DEFAULT_SOURCE if _GNU_SOURCE is defined.
Rather than having even more optional methods undefined unless
_GNU_SOURCE manually is, just change all remaining guarts to
use _DEFAULT_SOURCE instead.

Fixes #19095.

Change-Id: I5c7baf40b7fb37913e24279589fc1ae706448a45
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8330
Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
(cherry picked from commit ca0afc640e7edd6190b7509f369a75192cbe3010)
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8286
2024-09-19 16:43:46 +00:00
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