Fix mismatch between copyright and copyright notice

The files was copyrighted LGPL-2, while the copyright notice mentioned
LGPL-2.1.

I'm assuming the mistake was in the copyright notice, not the copyright
itself.

Author: havardAasen

src/hal/hal.h

@@ -34,14 +34,14 @@
 */
 
 /** This library is free software; you can redistribute it and/or
-    modify it under the terms of version 2.1 of the GNU Lesser General
+    modify it under the terms of version 2 of the GNU Library General
     Public License as published by the Free Software Foundation.
     This library 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 Lesser General Public License for more details.
 
-    You should have received a copy of the GNU Lesser General Public
+    You should have received a copy of the GNU Library General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 

src/hal/hal_lib.c

@@ -28,14 +28,14 @@
 */
 
 /** This library is free software; you can redistribute it and/or
-    modify it under the terms of version 2.1 of the GNU Lesser General
+    modify it under the terms of version 2 of the GNU Library General
     Public License as published by the Free Software Foundation.
     This library 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 Lesser General Public License for more details.
 
-    You should have received a copy of the GNU Lesser General Public
+    You should have received a copy of the GNU Library General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.