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[libc] Add strncat()

--- 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

+          strrchr.o strcat.o strncpy.o strncat.o

 all: libc.a

--- /dev/null

+++ b/libc/src/strncat.c

@@ -1,0 +1,16 @@

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

+

+#include <string.h>

+

+char *

+strncat(char *dst, const char *src, size_t n)

+{

+	char *ret = dst;

+

+	while (*dst)

+		++dst;

+	while (n-- > 0 && *src)

+		*dst++ = *src++;

+	*dst = '\0';

+	return ret;

+}