Copyright for bogl source package in Stretch

BOGL was written by Ben Pfaff , and packaged by Daniel
Jacobowitz .

Copyright:
	Copyright (C) 1991 Free Software Foundation, Inc.
	Copyright (C) 2002 Red Hat Inc 
	Copyright (C) 1984-1989, 1994 Adobe Systems Incorporated.
	Copyright (C) 1988, 1994 Digital Equipment Corporation.

License:

BOGL is distributed under the terms of the GNU General Public License,
version 2 (or later).  The full text of the GPL may be found in
/usr/share/common-licenses/GPL-2 on a Debian system, or obtained from the Free
Software Foundation.