remove warning in parse.c:80

src/lxc/parse.c

@@ -20,8 +20,10 @@
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
-#include <string.h>
+#define _GNU_SOURCE
 #include <stdio.h>
+#undef _GNU_SOURCE
+#include <string.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <dirent.h>