maint: run "make update-copyright"

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

data/glr.c

@@ -1,8 +1,8 @@
                                                                     -*- 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
@@ -150,7 +150,7 @@ m4_changecom()
 m4_divert_push(0)dnl
 @output(b4_parser_file_name@)@
 b4_copyright([Skeleton implementation for Bison GLR parsers in C],
-  [2002, 2003, 2004, 2005, 2006])
+             [2002, 2003, 2004, 2005, 2006, 2009])
 [
 /* C GLR parser skeleton written by Paul Hilfinger.  */
 
@@ -2639,7 +2639,7 @@ m4_if(b4_skeleton, ["glr.c"],
 [b4_defines_if(
 [@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])
 
 b4_shared_declarations