[PATCH v6 3/5] Use _dl_writev on __libc_message_impl

[Florian Weimer]

* Adhemerval Zanella:

> And change _dl_writev to return a negative errno in case of failure.
> This keeps the required semantics for not setting errno on failure
> and allows removing the Linux libc_fatal.c implementation.
>
> It also makes it simple to use the writev syscall during process
> startup, especially on i386, where it requires disabling vDSO.
>
> Checked on x86_64-linux-gnu and i686-linux-gnu.
> Reviewed-by: Florian Weimer <fweimer@redhat.com>

Missing blank line between Git trailer and rest of commit message.

Thanks,
Florian