Cleanup: add BEGIN/END to GPL headers

source/blender/draw/intern/draw_debug.c

@@ -1,5 +1,5 @@
 /*
- * Copyright 2018, Blender Foundation.
+ * ***** BEGIN GPL LICENSE BLOCK *****
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -15,8 +15,11 @@
  * along with this program; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  *
+ * Copyright 2018, Blender Foundation.
  * Contributor(s): Blender Institute
  *
+ * ***** END GPL LICENSE BLOCK *****
+ *
  */
 
 /** \file blender/draw/intern/draw_debug.c