src: use NFPROTO_ constants

Resync netfilter.h from the latest kernel and make use of the new
NFPROTO_ constants that have been introduced.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/extensions/libxt_state.c b/extensions/libxt_state.c
index 3af2e48..95d7db5 100644
--- a/extensions/libxt_state.c
+++ b/extensions/libxt_state.c
@@ -136,7 +136,7 @@
 }
 
 static struct xtables_match state_match = { 
-	.family		= AF_INET,
+	.family		= NFPROTO_IPV4,
 	.name		= "state",
 	.version	= XTABLES_VERSION,
 	.size		= XT_ALIGN(sizeof(struct xt_state_info)),
@@ -150,7 +150,7 @@
 };
 
 static struct xtables_match state_match6 = { 
-	.family		= AF_INET6,
+	.family		= NFPROTO_IPV6,
 	.name		= "state",
 	.version	= XTABLES_VERSION,
 	.size		= XT_ALIGN(sizeof(struct xt_state_info)),