replacing chat/unrealircd with unrealircd6?

[Thomas Klausner <wiz%netbsd.org@localhost>]

Hi!

We have chat/unrealircd and chat/unrealircd6.  I didn't find a reason
for the two versions in the commit logs.

Upstream is only maintaining 6.x (and just published a major security
update).

I propose moving unrealircd6 to unrealircd. (If someone would update
it to a newer version), I'd appreciate it.

Comments?
 Thomas