xtables-addons: update to version 2.5

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42256 3c298f89-4303-0410-b956-a3cf2f4a3e73
uclient: update to latest version, fixes HTTP keepalive issues

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42257 3c298f89-4303-0410-b956-a3cf2f4a3e73