Fix/Update copyright notices; Add SPDX annotation

Let's fix some erroneous/accidential references to wrong license,
update copyright information where applicable and introduce a
SPDX-License-Identifier to all files.

Change-Id: I39af26c6aaaf5c926966391f6565fc5936be21af
diff --git a/src/bitvec.c b/src/bitvec.c
index e86315c..884eb02 100644
--- a/src/bitvec.c
+++ b/src/bitvec.c
@@ -1,9 +1,11 @@
 /* (C) 2009 by Harald Welte <laforge@gnumonks.org>
  * (C) 2012 Ivan Klyuchnikov
- * (C) 2015 by Sysmocom s.f.m.c. GmbH
+ * (C) 2015 by sysmocom - s.f.m.c. GmbH
  *
  * All Rights Reserved
  *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
  * 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