Patch to utf-tool.el for >= emacs-23.

utf-tool-23.patch

--- utf-tool.el.orig    2013-02-20 08:17:48.933065400 +0900
+++ utf-tool.el 2013-02-20 08:09:10.473884298 +0900
@@ -62,7 +62,7 @@
       (unless
           (memq charset '(ascii japanese-jisx0208 katakana-jisx0201))
         (if (or (< char 256)
-                (memq 'mule-utf-8 (find-coding-systems-region pos (1+ pos)))
+                (memq 'utf-8 (find-coding-systems-region pos (1+ pos)))
                 (get-char-property pos 'untranslated-utf-8))
             (setq unicode (or (get-char-property pos 'untranslated-utf-8)
                               (encode-char char 'ucs))))