Add missing stat.h include to start.c

src/lxc/start.c

@@ -36,6 +36,7 @@
 #include <sys/param.h>
 #include <sys/file.h>
 #include <sys/mount.h>
+#include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/prctl.h>
 #include <sys/types.h>