[NET]: Cut off the queue_mapping field from sk_buff

Just hide it behind the #ifdef, because nobody wants
it now.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -300,8 +300,9 @@ struct sk_buff {
 #endif
 
 	int			iif;
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
 	__u16			queue_mapping;
-
+#endif
 #ifdef CONFIG_NET_SCHED
 	__u16			tc_index;	/* traffic control index */
 #ifdef CONFIG_NET_CLS_ACT