iptables: revert r40916

it causes problems with newer iptables when ipv6 is disabled as iptc uncoditionally links ip6tc

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 45350

package/network/utils/iptables/Makefile

@@ -393,7 +393,7 @@ define Package/libiptc
 $(call Package/iptables/Default)
   SECTION:=libs
   CATEGORY:=Libraries
-  DEPENDS:=+libip4tc +IPV6:libip6tc
+  DEPENDS:=+libip4tc +libip6tc
   TITLE:=IPv4/IPv6 firewall - shared libiptc library (compatibility stub)
 endef