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.
In this case I don't think my patch would make it, current release is from 2000. Ircd is the official server for IRCNet. If you are part of the IRCnet network (73 servers, list: http://irc.tu-ilmenau.de/all_servers/) the limits may make sense. But none of the official servers run on Mac. For this reason, ```configure``` asks to edit config.h file when it finishes:

```
[...]
config.status: creating setup.h
config.status: executing chmod commands
Have you read doc/README? (I hope so)
Next cd i686-apple-darwin13.2.0, edit "config.h" and "Makefile",
run "make all" to build and "make install" to install.
```