adding patch for iptables building on x86

external/Makefile

@@ -186,12 +186,15 @@ iptables/Makefile:
 	cp iptables-patch-1 iptables
 	cp iptables-patch-2 iptables
 	cp iptables-patch-3 iptables
+	cp iptables-patch-4 iptables
 	-cd iptables && \
 	 	patch -N -p1 --reject-file=- < iptables-patch-1
 	-cd iptables && \
 	 	patch -N -p1 --reject-file=- < iptables-patch-2
 	-cd iptables && \
 	 	patch -N -p1 --reject-file=- < iptables-patch-3
+	-cd iptables && \
+	 	patch -N -p0 --reject-file=- < iptables-patch-4
 	cd iptables && ./autogen.sh
 	cp config.sub iptables
 	cp config.guess iptables

external/iptables-patch-4

@@ -0,0 +1,10 @@
+--- extensions/libipt_ULOG.c	2015-05-13 11:59:59.752055326 -0400
++++ extensions/libipt_ULOG.new.c	2015-05-13 12:09:29.410078607 -0400
+@@ -12,6 +12,7 @@
+ #include <stdio.h>
+ #include <string.h>
+ #include <xtables.h>
++#define ffs(i) __builtin_ffs(i)
+ /* For 64bit kernel / 32bit userspace */
+ #include <linux/netfilter_ipv4/ipt_ULOG.h>
+