Don't rely on defaults in decoding UTF-8 encoded Lisp files

* lisp/replace.el:
* lisp/textmodes/rst.el:
* lisp/whitespace.el: Add an explicit UTF-8 encoding tag.

lisp/replace.el

-;;; replace.el --- replace commands for Emacs
+;;; replace.el --- replace commands for Emacs            -*- coding: utf-8 -*-
 
 ;; Copyright (C) 1985-1987, 1992, 1994, 1996-1997, 2000-2015 Free
 ;; Software Foundation, Inc.

lisp/textmodes/reftex.el

@@ -2446,7 +2446,7 @@ of ENTRY-LIST is a list of cons cells (\"MACRONAME\" . LEVEL).  See
 
 ;;;***
 
-;;;### (autoloads nil "reftex-cite" "reftex-cite.el" "43a3f05c024aee5b7708420f74266933")
+;;;### (autoloads nil "reftex-cite" "reftex-cite.el" "751df6ee674ea533b755e8cda4ad1cf8")
 ;;; Generated autoloads from reftex-cite.el
 
 (autoload 'reftex-default-bibliography "reftex-cite" "\

lisp/textmodes/rst.el

@@ -4235,4 +4235,8 @@ column is used (fill-column vs. end of previous/next line)."
 
 (provide 'rst)
 
+;; Local Variables:
+;; coding: utf-8
+;; End:
+
 ;;; rst.el ends here

lisp/whitespace.el

@@ -2581,5 +2581,8 @@ It should be added buffer-locally to `write-file-functions'."
 
 (run-hooks 'whitespace-load-hook)
 
+;; Local Variables:
+;; coding: utf-8
+;; End:
 
 ;;; whitespace.el ends here