Fix a few problems with directed quotes

This is in response to a problem report by Kaushal Modi in:
http://bugs.gnu.org/21588#25
* lisp/cedet/mode-local.el (describe-mode-local-overload):
* lisp/emacs-lisp/bytecomp.el (byte-compile-fix-header):
* lisp/info-xref.el (info-xref-check-all-custom):
* lisp/mail/emacsbug.el (report-emacs-bug-hook):
Prefer directed to undirected single quotes in diagnostics.

lisp/emacs-lisp/bytecomp.el

@@ -2015,7 +2015,7 @@ and will be removed soon.  See (elisp)Backquote in the manual."))
        (format "     (string-lessp emacs-version \"%s\")\n" minimum-version)
        ;; Because the header must fit in a fixed width, we cannot
        ;; insert arbitrary-length file names (Bug#11585).
-       "     (error \"'%s' was compiled for "
+       "     (error \"`%s' was compiled for "
        (format "Emacs %s or later\" #$))\n\n" minimum-version))
       ;; Now compensate for any change in size, to make sure all
       ;; positions in the file remain valid.

lisp/emacs-lisp/elint.el

@@ -520,7 +520,7 @@ Return nil if there are no more forms, t otherwise."
 	      ;;; 	(with-syntax-table emacs-lisp-mode-syntax-table
 	      ;;; 	  (elint-update-env))
 	      ;;; 	(setq env (elint-env-add-env env elint-buffer-env))))
-	      ;;(message "Elint processed (require '%s)" name))
+	      ;;(message "%s" (format "Elint processed (require '%s)" name))
 	  (error "%s.el not found in load-path" libname)))
     (error
      (message "Can't get variables from require'd library %s: %s"