xtables-addons: update to 2.7 to fix compilation with 4.1

Also drop the configure (not .ac) patch part as autoreconf will
overwrite it anyway with a newly generated version.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Acked-by: Jo-Philipp Wich <jow@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46385 3c298f89-4303-0410-b956-a3cf2f4a3e73