maint: automate annual package-wide copyright-year update.

* .x-update-copyright: New.
* Makefile.am (EXTRA_DIST): Remove maint.mk.
* bootstrap.conf (gnulib_modules): Add maintainer-makefile and
update-copyright.  Remove gnumakefile, which is implied by
maintainer-makefile.
* cfg.mk (bootstrap-tools): Copy from old maint.mk.
* gnulib: Update.
* maint.mk: Remove, now copied from gnulib.
* examples/extexi: Add missing "(C)" in copyright statement so
update-copyright can recognize it.
* src/LR0.h: Likewise.
* src/print.h: Likewise.
* src/print_graph.h: Likewise.
* src/named-ref.c: Likewise.
* src/named-ref.h: Likewise.
* src/gram.c: Add missing comma in copyright statement.
* src/gram.h: Likewise.
(cherry picked from commit dbbb64f091)

Conflicts:

	Makefile.am
	gnulib
	maint.mk
	src/gram.h

examples/extexi

@@ -1,7 +1,8 @@
 # Extract all examples from the manual source.            -*- AWK -*-
 
 # This file is part of GNU Bison
-# Copyright 1992, 2000, 2001, 2005, 2006 Free Software Foundation, Inc.
+# Copyright (C) 1992, 2000, 2001, 2005, 2006, 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