ipv4: Make inet_sock.h independent of route.h

inet_iif() in inet_sock.h requires route.h. Since users of inet_iif()
usually require other route.h functionality anyway this patch moves
inet_iif() to route.h.

Signed-off-by: KOVACS Krisztian <hidden@sch.bme.hu>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 33e2ac6..0b2071d 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -22,6 +22,7 @@
 
 #include <net/checksum.h>
 #include <linux/netfilter.h>		/* for union nf_inet_addr */
+#include <linux/ip.h>
 #include <linux/ipv6.h>			/* for struct ipv6hdr */
 #include <net/ipv6.h>			/* for ipv6_addr_copy */