bug#6997: Loading w32-fns under X11 signals an error

[Juanma Barranquero <lekktu@gmail.com>]

> The title says it.  It probably also messes with things, additionally to
> signalling an error.  Of course, you will say "don't do that", but
> remember that files may be loaded for all kinds of reasons, so they
> should be harmless.

You can avoid the warning with judicious application of

  (when (fboundp 'set-message-beep)
    ...)

and

 (when (boundp 'w32-charset-info-alist)
  ...)

but making the loading harmless will likely need some more uglifying
of the code.

Perhaps these really-specific modules should just have protection guards:

(when (eq system-type 'windows-nt)
  ;;; rest of the file
  )
(provide 'xxx)

    Juanma