Remove the GPL license.

Also remove the header with two copyright lines. It seems clear what
the copyright of this file is even without these two lines.

LICENSE

@@ -1,29 +1,4 @@
-Copyright (c) 2006-2010, UNINETT AS.
-Copyright (c) 2010-2012, NORDUnet A/S.
-
-The radsecproxy source code is subject to two licenses, you may pick
-the one that best suits your needs.
-
-
-The radsecproxy source code is subject to the terms of the GNU General
-Public License Version 2 or later (GPL) with the following exemption.
-
- * In addition, as a special exception, the copyright holders give
- * permission to link the code of portions of this program with the
- * OpenSSL library under certain conditions as described in each
- * individual source file, and distribute linked combinations
- * including the two.
- * You must obey the GNU General Public License in all respects
- * for all of the code used other than OpenSSL.  If you modify
- * file(s) with this exception, you may extend this exception to your
- * version of the file(s), but you are not obligated to do so.  If you
- * do not wish to do so, delete this exception statement from your
- * version.  If you delete this exception statement from all source
- * files in the program, then also delete it here.
-
-
-Alternatively the radsecproxy source code is subject to the terms of the
-below BSD style license.
+Radsecproxy is distributed under this license:
 
 * Copyright (c) 2006-2010, UNINETT AS.
 * Copyright (c) 2010-2012, NORDUnet A/S.