all: SPDX header conversion

$ find * -type f |xargs perl contrib/scripts/spdx.pl
  $ git rm contrib/scripts/spdx.pl

examples/python/gi/checkpoint.py

@@ -1,13 +1,6 @@
 #!/usr/bin/env python
+# 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
-# (at your option) any later version.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program. If not, see <http://www.gnu.org/licenses/>.
-#
 # Copyright 2017 Red Hat, Inc.
 
 import sys