kernel: change ipt depends to a select

Fixes recursive dependencies with kmod-ipt-core.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 37426

package/kernel/linux/modules/netfilter.mk

@@ -38,7 +38,7 @@ $(eval $(call KernelPackage,ipt-core))
 
 define AddDepends/ipt
   SUBMENU:=$(NF_MENU)
-  DEPENDS+= kmod-ipt-core $(1)
+  DEPENDS+= +kmod-ipt-core $(1)
 endef