bug#31148: 26.1; require w32 errors

[Alex Branham]

On Fri 13 Apr 2018 at 10:13, Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Alex Branham <alex.branham@gmail.com>
>> Date: Fri, 13 Apr 2018 09:50:47 -0500
>>
>> If you try
>>
>> (require 'w32-fns)
>>
>> or
>>
>> (require 'w32-fns nil t)
>>
>> It produces an error void-function set-message-beep. This is reproducible 
>> for me from emacs -q.
>
> Don't do that, then, unless you are in a w32 Emacs.

What's the recommended way for packages to rely on these functions then?
It seems annoying to wrap every call to w32-functions in
(if (fboundp ...) (w32-...))