* Makefile.in: (add-info-suffix, remove-info-suffix): New targets.

* Makefile.in: (add-info-suffix, remove-info-suffix): New targets.
(package, install-package, package-ja, install-package-ja): Use them.
(xinfo, xinfo-ja): Only build infos.
* texi/Makefile.in (add-info-suffix): Chdir ../lisp first.
* lisp/dgnushack.el (dgnushack-add-info-suffix-maybe): Chdir ../texi first.
(dgnushack-install-package): Don't refer to `package-path'; error if the
package path does not found.
(TopLevel): Don't define `gnus-revision-number', `gnus-version-number' and
`package-path'.