Include linux/idr.h and linux/skbuff.h since they are required by objects that
are declared in the net structure.
 struct net {
	...
	struct idr		netns_ids;
	...
	struct sk_buff_head	wext_nlevents;
	...
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
 #include <net/netns/xfrm.h>
 #include <net/netns/mpls.h>
 #include <linux/ns_common.h>
+#include <linux/idr.h>
+#include <linux/skbuff.h>
 
 struct user_namespace;
 struct proc_dir_entry;