iptables: disable unused xml support to save some space

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45617 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/network/utils/iptables/patches/050-optional-xml.patch

+--- a/iptables/xtables-multi.c
++++ b/iptables/xtables-multi.c
+@@ -22,8 +22,10 @@ static const struct subcommand multi_sub
+ 	{"iptables-restore",    iptables_restore_main},
+ 	{"restore4",            iptables_restore_main},
+ #endif
++#ifdef ENABLE_XML
+ 	{"iptables-xml",        iptables_xml_main},
+ 	{"xml",                 iptables_xml_main},
++#endif
+ #ifdef ENABLE_IPV6
+ 	{"ip6tables",           ip6tables_main},
+ 	{"main6",               ip6tables_main},