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[libc] Add memcpy()

--- 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

+          memset.o memcpy.o

 all: libc.a

--- /dev/null

+++ b/libc/src/memcpy.c

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

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

+

+#include <string.h>

+

+void *

+memcpy(void *dst, const void *src, size_t n)

+{

+	char *s1 = dst, *s2 = (char *) src;

+

+	while (n-- > 0)

+		*s1++ = *s2++;

+	return dst;

+}