libroot: move memmem for POSIX.1/2024

Change-Id: I1b051586c993cd0e3d43abaa22a3722699f7134e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8517
Tested-by: Commit checker robot <no-reply+buildbot@

libroot: move memmem for POSIX.1/2024

Change-Id: I1b051586c993cd0e3d43abaa22a3722699f7134e
Reviewed-on: https://review.haiku-os.org/c/haiku/+/8517
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

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