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

m4/.gitignore

@@ -11,6 +11,7 @@
 /exitfail.m4
 /extensions.m4
 /getopt.m4
+/getpagesize.m4
 /gettext.m4
 /gnulib-cache.m4
 /gnulib-common.m4
@@ -40,6 +41,7 @@
 /mbstate_t.m4
 /mbswidth.m4
 /memchr.m4
+/mmap-anon.m4
 /multiarch.m4
 /nls.m4
 /po.m4