* manual/Makefile (info): Don't depend on dir-add.info.

* manual/Makefile (info): Don't depend on dir-add.info.

	(libc.dvi libc.pdf libc.info): Depend on dir-add.texi.
	(dir-add.info): Target removed, replaced with ...
	(dir-add.texi): New target.
	(distribute): Add it.
	(install): Remove variant with --section arguments.
	Let the @dircategory directives do their work.
	(mostlyclean): Don't remove dir-add.info here.
	(realclean): Remove dir-add.texi here.
	* manual/libc.texinfo: @include dir-add.texi
	* configure.in: Remove check for old Debian install-info.
	* configure: Regenerated.
	* config.make.in (OLD_DEBIAN_INSTALL_INFO): Variable removed.