[hurd,commited] htl: Add missing fork.h

[Adhemerval Zanella]

On 24/03/2021 10:00, Samuel Thibault wrote:
> Adhemerval Zanella, le mer. 24 mars 2021 09:56:47 -0300, a ecrit:
>> On 24/03/2021 09:45, Samuel Thibault wrote:
>>> Adhemerval Zanella, le mer. 24 mars 2021 09:40:36 -0300, a ecrit:
>>>> Why exactly tst-atfork2 fails without this includes?
>>>
>>> It misses the atfork unregister hook called at module unload.
>>
>> Ok, but *why* exactly? The sysdeps/htl/pt-atfork.c already
>> includes register-atfork.h after the fork.h inclusion.
> 
> It's not pt-atfork.c which needs UNREGISTER_ATFORK, but
> stdlib/cxa_finalize, which gets it from fork.h

Thanks, this is a good indication that is better to just remove
the ifdef UNREGISTER_ATFORK from cxa_finalize (since now it is
defined on generic implementation).