NFLOG and NFQUEUE targets' full support for iptables.

Includes all needed kernel modules (Xtables's and Netlink's)
 and userspace libraries.
All added kernel modules can be individually disabled,
 all other new libraries get their own individual packages.

Reported-by: Fabian Hugelshofer <hugelshofer2006@gmx.ch>
Reported-by: Rainer Poisel <rainer.poisel@fhstp.ac.at>
Reported-by: Derek LaHousse <dlahouss@mtu.edu>
Signed-off-by: Guillaume Déflache <guillaume.deflache@ibwag.com>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42030 3c298f89-4303-0410-b956-a3cf2f4a3e73

This commit implements a new netfilter match "xt_id" which can be used to
attach unsigned 32bit IDs to iptables rules.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>

Backport of r41945

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42007 3c298f89-4303-0410-b956-a3cf2f4a3e73

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@41864 3c298f89-4303-0410-b956-a3cf2f4a3e73