Fix build warning in c codes

There are some build warning observed when building c codes.
It is not critical as they are still warning, but it would be
better to avoid these warning if possible.

Trivial-fix
Change-Id: I5f89fc0defce43984471576025636e172630e733

scripts/restart_docker_container.c

@@ -15,7 +15,7 @@
  * ---------------------------------------------------------------------------
 */
 
-
+#define _GNU_SOURCE
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>

src/c/sbus/sbus.c

@@ -20,6 +20,7 @@
 
 #include <string.h>
 #include <sys/socket.h>
+#include <sys/stat.h>
 #include <syslog.h>
 #include <stdlib.h>
 #include <sys/un.h>