* Makefile.maint (cvs-sv): New macro, to be used..

* Makefile.maint (cvs-sv): New macro, to be used..
(config.guess-url_prefix, config.sub-url_prefix)
(texinfo.tex-url_prefix, standards.texi-url_prefix): ..here;
point to CVS text checkout of Gnulib files.
(copyright-check): Bump current year.
(announcement): Do not hard-wire `./announce-gen'.
(cvs-update): Propagate failures of `cvs' and `move-if-change'
correctly.
* Makefile.cfg (executable-update): Use `chmod a+x' instead of
`chmod +x'.
(wget_files): Update config.guess, config.sub, texinfo.tex by
`wget-update', now that their URLs work again.