[PATCH] signal: Use <sigsetops.h> for sigemptyset, sigfillset

[Florian Weimer]

* Adhemerval Zanella via Libc-alpha:

> On 28/04/2020 07:48, Florian Weimer wrote:
>> Any additional comments on this patch?  Thanks.
>> 
>
> LGTM, thanks.

Thanks, I pushed this without the spurious __glibc_unlikely change.