Disable netsplit detection in ircd-irc2

By default ircd-irc2 goes to netsplit mode if the amount of connected users or servers go below a certain limit.

Default limits are:
- less than 65000 users connected or
- less than 80 servers connected. 

This means that in practice all brew installed ircds are always in netsplit mode.

In netsplit mode no one can be channel operator. Channel operators
are useful already in small ircd setups. Therefore it's best to
disable netsplit detection. You need to administrate a popular IRC
network with multiple servers for netsplit detection to be useful.