Removed patch as upstream fixed libtirpc support differently.

Switched to normal tarballs for simplicity.

Fixed license information.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Peter Wagner <tripolar@gmx.at>
[split from https://github.com/openwrt/openwrt/pull/1274]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

In order to allow for the switch from librpc to libtirpc, we need to
relocate the conntrack-tools package here.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>