lxc_init: include config.h

src/lxc/lxc_init.c

@@ -21,6 +21,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "config.h"
+
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>