Update chat/irssi with PR pkg/49324 by Leonardo Taccari
from 0.8.16 to 0.8.17
(and also update accordingly chat/irssi-*/distinfo).

Changes:
v0.8.17 2014-10-11  The Irssi team <staff@irssi.org>
+ Document that SSL connections aren't properly handled during /UPGRADE.
  See Github PR #39.
+ Synchronize scripts with scripts.irssi.org.
+ Performance enhancement of the nicklist as well as the window_item_find
  function. See Github PR #24.
+ Disallow unloading of static modules.
+ Allow UTF-8 characters in /bind. See Github PR #18.
+ Split overlong outgoing messages instead of silently truncating them.
  Adds two new options: 'split_line_end' and 'split_line_start'.
  'split_line_end' contains a string added to the end of line fragments.
  'split_line_start' contains a string added to the beginning of line
  fragments. See Github PR #29.
+ Added special /ignore NO_ACT level to ignore only activity (see /help ignore).
+ Support for 256 and true color terminals (see Github PR #48).
+ Support for italics (see Github PR #58).
+ Rewrote many help files.
- Fixed various compiler warnings and use of deprecated functions.
- Fixed Perl API usage and added PERL_NO_GET_CONTEXT to reduce code size.
- Fixed format_get_text Perl API. See Github PR #23.
- Fixed gui_printtext_after and term_refresh_*() visibility. See Github PR #22.
- Fixed issue where UTF-8 characters was corrupted once for every 32k text.
  See Github PR #12.
- Fixed redrawing issue with right-aligned statusbar.
- Fixed use-after-free bug with cached settings values. See Github PR #147.

(mef)