* lisp/info.el (Info-default-directory-list): Remove obsolete suffixes.

; * etc/NEWS: Mention this.

etc/NEWS

@@ -253,6 +253,11 @@ details.
 *** New setf-able function to access and set image parameters is
 provided: 'image-property'.
 
+---
+** The default 'Info-default-directory-list' no longer checks some obsolete
+directory suffixes (gnu, gnu/lib, gnu/lib/emacs, emacs, lib, lib/emacs)
+when searching for info directories.
+
 +++
 ** The commands that add ChangeLog entries now prefer a VCS root directory
 for the ChangeLog file, if none already exists.  Customize

lisp/info.el

@@ -192,12 +192,8 @@ A header-line does not scroll with the rest of the buffer."
 	  (prune-directory-list '("/usr/local/" "/usr/" "/opt/" "/")))
 	 (suffixes
 	  ;; Subdirectories in each directory tree that may contain info
-	  ;; directories.  Most of these are rather outdated.
-	  ;; It ought to be fine to stop checking the "emacs" ones now,
-	  ;; since this is Emacs and we have not installed info files
-	  ;; into such directories for a looong time...
-	  '("share/" "" "gnu/" "gnu/lib/" "gnu/lib/emacs/"
-	    "emacs/" "lib/" "lib/emacs/"))
+	  ;; directories.
+	  '("share/" ""))
 	 (standard-info-dirs
 	  (apply #'nconc
 		 (mapcar (lambda (pfx)