Re-license asn1helper.c under identical license as upstream

asn1helpers.c originally existed in the repository of an application
(osmo-hnbgw, IIRC), and hence was under AGPLv3.  When moving it to
this repository, it should have been relicensed but wasn't.  The
intention was never to "contaminate" (lib)asn1c with AGPLv3 code.

Change-Id: I8e714d4c51d771b1eabec7aa06e7daae73f48b15
diff --git a/debian/copyright b/debian/copyright
index 91a7cb9..2eef07a 100644
--- a/debian/copyright
+++ b/debian/copyright
@@ -18,19 +18,7 @@
 
 Files: src/asn1helpers.c
 Copyright: 2014-2015 by Harald Welte <laforge@gnumonks.org>
-License:   AGPL-3.0+
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU Affero 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 Affero General Public License for more details.
- .
- You should have received a copy of the GNU Affero General Public License
- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+License: BSD-2-Clause
 
 Files: debian/*
 Copyright: 2017 Alexander Couzens <lynxis@stretch>
diff --git a/src/asn1helpers.c b/src/asn1helpers.c
index aca5300..a4ced70 100644
--- a/src/asn1helpers.c
+++ b/src/asn1helpers.c
@@ -3,19 +3,8 @@
 /* (C) 2014-2015 by Harald Welte <laforge@gnumonks.org>
  * All Rights Reserved
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Affero 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 Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
+ * Redistribution and modifications are permitted subject to BSD license
+ * contained in COPYING file.
  */
 
 #include <string.h>