Add ircd-ratbox.

This is a port of the ircd-ratbox IRC daemon.

ircd-ratbox is the primary ircd used on EFnet; it combines the stability
of an ircd required for a large production network together with a rich
set of features, making it also suitable for use on smaller networks.

WWW: http://www.ircd-ratbox.org/

PR: ports/92404
Submitted by: Shaun Amott <shaun@inerd.com>