[PATCH (pkgs/locale)] Fix -help in Japanese UTF-8 setups

[Stephen J. Turnbull]

APPROVE

Technically, you could use (fboundp 'char-to-unicode) or something
like that which is specific to the Unicode support which started in
21.5.8 or so.  But your version test is a lot easier to understand.

 > The attached patch crudely fixes it.  Unless someone objects or comes
 > up with a better way to fix it, will apply in a couple of days.

 > 2007-05-08  Ville Skyttä  <scop at xemacs.org>
 > 
 > 	* start-files/ja/locale-start.el (command-line-do-help):
 > 	Don't try to load `un-define' with XEmacs >= 21.5.