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[libc] Add strrchr()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -1,7 +1,8 @@

 # See LICENSE file for copyright and license details.

 .POSIX:

-LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o

+LIBCOBJ = assert.o strcpy.o strcmp.o strlen.o strchr.o \

+          strrchr.o

 all: libc.a

--- /dev/null

+++ b/libc/src/strrchr.c

@@ -1,0 +1,15 @@

+/* See LICENSE file for copyright and license details. */

+

+#include <string.h>

+

+char *

+strrchr(const char *s, int c)

+{

+	char *t;

+

+	for (t = (char *) s; *t; ++t)

+		/* nothing */;

+	while (t > s && *t != c)

+		--t;

+	return (*t == c) ? t : NULL;

+}