iptables: backport patch fixing bug with string module

Backport patch fixing critical bug with string module merged upstream.

Fixes: #13812
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
(cherry picked from commit 3d6b89c514)

package/network/utils/iptables/Makefile

@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=iptables
 PKG_VERSION:=1.8.8
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE_URL:=https://netfilter.org/projects/iptables/files
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2