iproute2: add drop-failed rule action (patch by Jonas Gorski)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36910 3c298f89-4303-0410-b956-a3cf2f4a3e73
linux: add ipv6 failed-policy routing action (by Jonas Gorski)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36911 3c298f89-4303-0410-b956-a3cf2f4a3e73