Add hackint to the network list.

Hi, I'd like to add the hackint irc network to the default list of available networks of hexchat if possible.

Hackint is around since ~2008 under that name. We are ircv3.1 compatible. Since non-ssl usage is discouraged, I've enclosed the whole hackint definition inside the ifdef{} block, hope that's okay.

Hackint website: http://www.hackint.org