globally replace NETFILTER_VERSION with IPTABLES_VERSION to have consistent naming
diff --git a/extensions/libipt_DNAT.c b/extensions/libipt_DNAT.c
index 279f76e..9b82675 100644
--- a/extensions/libipt_DNAT.c
+++ b/extensions/libipt_DNAT.c
@@ -25,7 +25,7 @@
 " --to-destination <ipaddr>[-<ipaddr>][:port-port]\n"
 "				Address to map destination to.\n"
 "				(You can use this more than once)\n\n",
-NETFILTER_VERSION);
+IPTABLES_VERSION);
 }
 
 static struct option opts[] = {
@@ -228,7 +228,7 @@
 struct iptables_target dnat
 = { NULL,
     "DNAT",
-    NETFILTER_VERSION,
+    IPTABLES_VERSION,
     IPT_ALIGN(sizeof(struct ip_nat_multi_range)),
     IPT_ALIGN(sizeof(struct ip_nat_multi_range)),
     &help,