Add rawmemchr module, matching glibc. * modules/string (Makefile.am): New indicator. * m4/string_h.m4 (gl_HEADER_STRING_H_DEFAULTS): Set it. * lib/string.in.h (rawmemchr): Declare when appropriate. * modules/rawmemchr: New file. * m4/rawmemchr.m4: Likewise. * lib/rawmemchr.c: Likewise. * modules/rawmemchr-tests: Likewise. * tests/test-rawmemchr.c: Likewise. * doc/glibc-functions/rawmemchr.texi (rawmemchr): Document module. * modules/strchrnul (Depends-on): Add rawmemchr. * lib/strchrnul.c (strchrnul): Optimize a corner case. Signed-off-by: Eric Blake <ebb9@byu.net>

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+Description:
+rawmemchr() function: Find the first occurrence of C in S.
+
+Files:
+lib/rawmemchr.c
+m4/rawmemchr.m4
+
+Depends-on:
+extensions
+string
+
+configure.ac:
+gl_FUNC_RAWMEMCHR
+gl_STRING_MODULE_INDICATOR([rawmemchr])
+
+Makefile.am:
+
+Include:
+<string.h>
+
+License:
+LGPL
+
+Maintainer:
+FSF