* lisp/Makefile.in (autoloads): Do not use abs_lisp.

This should stop recent weirdness, eg:
http://lists.gnu.org/archive/html/emacs-diffs/2013-10/msg00381.html

* lisp/emacs-lisp/autoload.el: Comment.

lisp/emacs-lisp/autoload.el

@@ -528,6 +528,9 @@ Return non-nil if and only if FILE adds no autoloads to OUTFILE
 		(if (stringp generated-autoload-load-name)
 		    generated-autoload-load-name
 		  (autoload-file-load-name absfile)))
+          ;; FIXME? Comparing file-names for equality with just equal
+          ;; is fragile, eg if one has an automounter prefix and one
+          ;; does not, but both refer to the same physical file.
           (when (and outfile
                      (not
 		      (if (memq system-type '(ms-dos windows-nt))