s3:libads/kerberos_proto.h: add GPL/Copyright header

source3/libads/kerberos_proto.h

@@ -1,3 +1,32 @@
+/*
+ *  Unix SMB/CIFS implementation.
+ *  kerberos utility library
+ *
+ *  Copyright (C) Andrew Tridgell			2001
+ *  Copyright (C) Remus Koos (remuskoos@yahoo.com)	2001
+ *  Copyright (C) Luke Howard				2002-2003
+ *  Copyright (C) Jim McDonough <jmcd@us.ibm.com>	2003
+ *  Copyright (C) Guenther Deschner			2003-2008
+ *  Copyright (C) Andrew Bartlett <abartlet@samba.org>	2004-2005
+ *  Copyright (C) Jeremy Allison			2004,2007
+ *  Copyright (C) Stefan Metzmacher			2004-2005
+ *  Copyright (C) Nalin Dahyabhai <nalin@redhat.com>	2004
+ *  Copyright (C) Gerald Carter				2006
+ *
+ *  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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
 struct PAC_LOGON_INFO;
 
 #include "libads/ads_status.h"