[NET] rtnetlink: Add RTPROT entry for Netsukuku.

The Netsukuku daemon is using the same number to mark its routes, you
can see it here:
http://hinezumilabs.org/cgi-bin/viewcvs.cgi/netsukuku/src/krnl_route.h?rev=HEAD&content-type=text/vnd.viewcvs-markup

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index d263853..d572d53 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -199,6 +199,7 @@
 #define RTPROT_BIRD	12	/* BIRD */
 #define RTPROT_DNROUTED	13	/* DECnet routing daemon */
 #define RTPROT_XORP	14	/* XORP */
+#define RTPROT_NTK	15	/* Netsukuku */
 
 /* rtm_scope