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[libc] Add strncmp

--- a/libc/src/Makefile

+++ b/libc/src/Makefile

@@ -2,7 +2,7 @@

 .POSIX:

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

-          strrchr.o strcat.o strncpy.o strncat.o strcoll.o \

+          strrchr.o strcat.o strncmp.o strncpy.o strncat.o strcoll.o \

           strxfrm.o strtok.o \

           memset.o memcpy.o memmove.o memcmp.o memchr.o \

           isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \

--- /dev/null

+++ b/libc/src/strncmp.c

@@ -1,0 +1,11 @@

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

+

+#include <string.h>

+

+int

+strncmp(const char *s1, const char *s2, size_t n)

+{

+	for (; n && *s1 && *s2 && *s1 != *s2; --n, ++s1, ++s2);

+		/* nothing */;

+	return n ? (*(unsigned char *)s1 - *(unsigned char *)s2) : 0;

+}