add copyright message to download_boost.cmake

CMakeModules/download_boost.cmake

+#  This program source code file is part of KICAD, a free EDA CAD application.
+#
+#  Copyright (C) 2013 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
+#  Copyright (C) 2013 Kicad Developers, see AUTHORS.txt for contributors.
+#
+#  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, you may find one here:
+#  http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+#  or you may search the http://www.gnu.org website for the version 2 license,
+#  or you may write to the Free Software Foundation, Inc.,
+#  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+
+
 
 # Download and patch boost headers to a particular version.
 # Assumes include( ExternalProject ) was done inline previous to this file.