Attribute copyright of vlc_current_charset() to Bruno Haible, per his request

Backported from 7b76e347

src/misc/charset.c

@@ -4,7 +4,7 @@
  * See also unicode.c for Unicode to locale conversion helpers.
  *
  * Copyright (C) 2003-2006 the VideoLAN team
- * $Id$
+ * $Id: 0b6a323177710edc4e6333c20f18278c2b23e729 $
  *
  * Authors: Derk-Jan Hartman <thedj at users.sf.net>
  *          Christophe Massiot
@@ -15,6 +15,11 @@
  *  Copyright (C) 2001-2003 The Mape Project
  *  Written by Karel Zak  <zakkr@zf.jcu.cz>.
  *
+ * which itself is an adaptation of locale_charset():
+ *
+ *  Copyright (C) 2000-2002 Free Software Foundation, Inc.
+ *  Written by Bruno Haible <bruno@clisp.org>.
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or