fix typo in iptables makefile resulting in patches not being applied (#5311)

SVN-Revision: 16392

package/iptables/Makefile

@@ -20,9 +20,9 @@ PKG_SOURCE_URL:=http://www.netfilter.org/projects/iptables/files \
 	ftp://ftp.no.netfilter.org/pub/netfilter/iptables/
 
 ifeq ($(CONFIG_EXTERNAL_KERNEL_TREE),)
-PATCH_DIR:=./patches/$(PKG_VERSION)
-else
 PATCH_DIR:=
+else
+PATCH_DIR:=./patches/$(PKG_VERSION)
 endif
 
 PKG_FIXUP = libtool