Add missing copyright and license header

src/misc/variables.h

+/*****************************************************************************
+ * variables.h: object variables typedefs
+ *****************************************************************************
+ * Copyright (C) 2002-2006 the VideoLAN team
+ * $Id: variables.c 22331 2007-09-30 16:58:33Z courmisch $
+ *
+ * Authors: Samuel Hocevar <sam@zoy.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
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+
 typedef struct callback_entry_t callback_entry_t;
 
 /**