compel: plugins,std -- Implement generic std_memcpy

The routine was #if0ed for a while (taken from older compel), now it's
time to provide any generic version.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

compel/plugins/std/string.c

@@ -222,19 +222,11 @@ fin:
 
 void *std_memcpy(void *to, const void *from, unsigned int n)
 {
-	/* FIXME: Per-arch support */
-#if 0
-	int d0, d1, d2;
-	asm volatile("rep ; movsl		\n"
-		     "movl %4,%%ecx		\n"
-		     "andl $3,%%ecx		\n"
-		     "jz 1f			\n"
-		     "rep ; movsb		\n"
-		     "1:"
-		     : "=&c" (d0), "=&D" (d1), "=&S" (d2)
-		     : "0" (n / 4), "g" (n), "1" ((long)to), "2" ((long)from)
-		     : "memory");
-#endif
+	char *tmp = to;
+	const char *s = from;
+
+	while (n--)
+		*tmp++ = *s++;
 	return to;
 }