[PATCH] w32: Fix clang compiler error with function pointer

[Florian Weimer]

* Werner Koch via Gnupg-devel:

> On Mon, 12 Jun 2023 10:12, Biswapriyo Nath said:
>> Any comment on this patch? Is it possible to add the patch please?
>
> I see no reason to work around a clang oddity for a Windows target.  We
> have a well working toolchain and that is what you should use.

GCC will eventually make this change as well (although probably not in
GCC 14).  This hasn't been valid C for decades.

Thanks,
Florian