Add announce_ip support

[gkuenning]

Deluge can't be used as a seeder from behind a NAT firewall, even if the firewall is configured to forward the appropriate ports, because there is no way to announce the true IP to the tracker.

The enclosed patch modifies deluge 1.3.5 to add a -T switch (alias --libtorrent) that allows an announce_ip parameter to be passed to libtorrent. It also modifies libtorrent itself to correctly process that parameter.

As a pleasant side effect, all other libtorrent options can now be passed through from deluge.

[gkuenning]

Patch to add announce_ip support

[Cas]

Duplicate: #1384