Removes support for IRC since we can have a more decent implementation one day. The code is still on SVN so whoever needs it can easily reenable it.

build.xml

@@ -908,7 +908,6 @@
         bundle-sparkle, bundle-plugin-branding,
         bundle-osdependent,bundle-browserlauncher,
         bundle-zeroconf,bundle-plugin-zeroconfaccregwizz,
-        bundle-irc,bundle-plugin-ircaccregwizz,
         bundle-pluginmanager,bundle-skinmanager,bundle-notification,
         bundle-notification-config,bundle-contacteventhandler,
         bundle-plugin-contactinfo,bundle-plugin-chatalerter, bundle-keybindings,