bug#9655: 24.0.50; `set-locale-environment' should use completion

[Lars Ingebrigtsen <larsi@gnus.org>]

Eli Zaretskii <eliz@gnu.org> writes:

> Forgot to mention that this API has a Lisp binding in Emacs:
> w32-get-valid-locale-ids.  E.g., try
>
>   (mapcar 'w32-get-locale-info (w32-get-valid-locale-ids))

Looking at `set-locale-environment', it already has a bunch of hacks
that depend on Unix-related stuff:

  (setq locale-translation-file-name
	(let ((files
	       '("/usr/share/X11/locale/locale.alias" ; e.g. X11R7

I wonder whether we should just add an equally hacky `get-locale-names'
function that would call that w32 function (if defined), and if not,
just parse the output of "locale -a" (if "locale" exists on the system).

Any opinions?

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