weechat: Update to 2.5

Among the new features:

- add support of UNIX domain sockets in relay plugin
- add option relay.weechat.commands
- add trigger hooks "info" and "info_hashtable"
- add option xfer.network.speed_limit_recv
- add option weechat.look.buffer_time_same
- add option weechat.look.prefix_same_nick_middle
- add option "addreplace" in command /filter
- add bar items "irc_nick", "irc_host" and "irc_nick_host"
- add functions command_options and string_match_list in plugin API
- rename aspell plugin to spell
- use getopt to parse command line arguments
- many bugs fixed.

(nia)