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[libc] Add memchr()

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -3,7 +3,7 @@

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

           strrchr.o strcat.o strncpy.o strncat.o \

-          memset.o memcpy.o memmove.o memcmp.o

+          memset.o memcpy.o memmove.o memcmp.o memchr.o

 all: libc.a

--- /dev/null

+++ b/libc/src/memchr.c

@@ -1,0 +1,13 @@

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

+

+#include <string.h>

+

+void *

+memchr(const void *s, int c, size_t n)

+{

+	unsigned char *bp = (char *) s;

+

+	while (n > 0 && *bp++ != c)

+		--n;

+	return (n == 0) ? NULL : bp-1;

+}