[PATCH] msg.h needs list.h

msg.h uses list_head.  (I'm not sure what config actually required this, but
it is legit).

include/linux/msg.h

@@ -2,6 +2,7 @@
 #define _LINUX_MSG_H
 
 #include <linux/ipc.h>
+#include <linux/list.h>
 
 /* ipcs ctl commands */
 #define MSG_STAT 11