gnu: weechat: Encode as UTF-8.

* gnu/packages/weechat.scm: Reencode as UTF-8.

gnu/packages/weechat.scm

 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright  2014 Kevin Lemonnier <lemonnierk@ulrar.net>
-;;; Copyright  2015 Ludovic Courts <ludo@gnu.org>
+;;; Copyright © 2014 Kevin Lemonnier <lemonnierk@ulrar.net>
+;;; Copyright © 2015 Ludovic Courtès <ludo@gnu.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;