[PATCH v3 3/5] Use _dl_writev on __libc_message_impl

[Florian Weimer]

* Adhemerval Zanella:

> And change _dl_writev to return an negative errno in case of failure.
> This keeps the required semantic on not setting errno in case of
> failure and allow remove the Linux libc_fatal.c implementation.
>
> It also makes is simple to use writev syscall during process startup,
> specially on i386 where it requires to disable the vDSO usage.

The second part requires moving the implementation into a .c file,
though, and including <startup.h> when that .c file is built?

Thanks,
Florian