Avoid using - (hyphen) in gdbus-codegen directory name

It's an invalid character in Python module names and prevents us from
being able to import it.

https://bugzilla.gnome.org/show_bug.cgi?id=650763

gio/gdbus-2.0/codegen/config.py.in

@@ -0,0 +1,27 @@
+# -*- Mode: Python -*-
+
+# GDBus - GLib D-Bus Library
+#
+# Copyright (C) 2008-2011 Red Hat, Inc.
+#
+# This library 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 2 of the License, or (at your option) any later version.
+#
+# 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 License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+# Boston, MA 02111-1307, USA.
+#
+# Author: David Zeuthen <davidz@redhat.com>
+
+DATADIR = "@datarootdir@"
+DATADIR = DATADIR.replace(
+    "${prefix}", "@prefix@")
+VERSION = "@VERSION@"