Ed Maste 7f72497ef7 libc: Use musl's optimized strchr and strchrnul
Parentheses added to HASZERO macro to avoid a GCC warning, and formatted
with clang-format as we have adopted these and don't consider them
'contrib' code.

Obtained from:	musl (snapshot at commit 4d0a82170a25)
Reviewed by:	kib (libc integration), mjg (both earlier)
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17630
2021-03-01 21:09:59 -05:00
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