Remove net/amsn and net/pebrot?

[Frederic Cambus]

MSN Messenger has been discontinued in 2013.

Out of curiosity, I tried both of them to try to connect and see what
happens, and expectedly, both clients time out. As far as I know, there
is no open source server for the MSN protocol, so there is indeed no
way at all to use those clients anymore.