Do not use the LGPL v3 blurb for LGPL v2.1 files

GTK+ is released under the terms of the GNU LGPL v2.1+.

gtk/gtksidebarrow.c

@@ -4,7 +4,7 @@
  *
  * This file is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation; either version 3 of the
+ * published by the Free Software Foundation; either version 2.1 of the
  * License, or (at your option) any later version.
  *
  * This file is distributed in the hope that it will be useful, but
@@ -12,7 +12,7 @@
  * 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 General Public License
+ * You should have received a copy of the GNU Lesser General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 

gtk/gtksidebarrowprivate.h

@@ -4,7 +4,7 @@
  *
  * This file is free software; you can redistribute it and/or modify it
  * under the terms of the GNU Lesser General Public License as
- * published by the Free Software Foundation; either version 3 of the
+ * published by the Free Software Foundation; either version 2.1 of the
  * License, or (at your option) any later version.
  *
  * This file is distributed in the hope that it will be useful, but
@@ -12,7 +12,7 @@
  * 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 General Public License
+ * You should have received a copy of the GNU Lesser General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #ifndef GTK_SIDEBAR_ROW_PRIVATE_H