maint: run "make update-copyright"

But first...
* .x-update-copyright (^data/m4sugar/): Add, because these
files are from Autoconf.

data/glr.cc

@@ -1,8 +1,8 @@
                                                                     -*- C -*-
 
 # C++ GLR skeleton for Bison
-# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation,
-# Inc.
+# Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008-2009 Free
+# Software Foundation, Inc.
 
 # 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
@@ -219,7 +219,7 @@ m4_popdef([b4_parse_param])
 m4_divert_push(0)
 @output(b4_spec_defines_file@)@
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-  [2002, 2003, 2004, 2005, 2006])[
+             [2002, 2003, 2004, 2005, 2006, 2009])[
 
 /* C++ GLR parser skeleton written by Akim Demaille.  */