iptables: using external kernel tree should not alter patch behaviour.

iptables is the only exception in the package tree, causing patch
behaviour to be inconsistent on this package.

Signed-off-by: Rick van der Zwet <rick.vanderzwet@anywi.com>

SVN-Revision: 48643

package/network/utils/iptables/Makefile

@@ -24,10 +24,6 @@ PKG_INSTALL:=1
 PKG_BUILD_PARALLEL:=1
 PKG_LICENSE:=GPL-2.0
 
-ifneq ($(CONFIG_EXTERNAL_KERNEL_TREE),"")
-PATCH_DIR:=
-endif
-
 include $(INCLUDE_DIR)/package.mk
 ifeq ($(DUMP),)
   -include $(LINUX_DIR)/.config