Pedro F. Giffuni e9fe9edde7 libc/regex: fix two buffer underruns.
Fix some rather complex regex issues found on OpenBSD as part of some
ongoing work to fix a sed(1) bug.

Curiously the OpenBSD tests don't trigger segfaults on FreeBSD but the
bugs were confirmed by running a port of FreeBSD's regex under OpenBSD's
malloc. Huge thanks to Ingo for confirming the behavior.

Taken from:	Ingo Schwarze (through openbsd-tech 2016-05-15)
MFC after:	1 week
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