* Fixes compilation against eglibc
 * Fixes tracking logic when selectively restarting IPv4 or IPv6 firewall
 * Fixes tracking logic for user chains by differentiating between reloads and restarts
 * Introduces per-zone user chains {input,output,forwarding,prerouting,postrouting}_$zone_rule
 * Supports legacy "tcpudp" protocol notation again

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35969 3c298f89-4303-0410-b956-a3cf2f4a3e73