* distdir.am (distdir): Be sure to have permissive rights on its

* distdir.am (distdir): Be sure to have permissive rights on its
contents.
(dist-all, dist-bzip2, dist-zip, dist-tarZ): New conditional
targets.
And BTW, all these guys are phony.
* automake.in (&handle_dist_worker): As its name doesn't indicate,
output distributions.
(&handle_dist): As its name doesn't indicate, don't.
(&initialize_global_constants): Don't define variables which
content is now handled by distdir.am.
But register `dist-all' as a factored target.
(&handle_factored_dependencies): Don't output empty targets.