perror() changes the orientation of stderr to byte-oriented mode if stderr is not oriented yet.

[Takashi Yano]

Hi Corinna,

On Thu, 5 Jul 2018 11:08:51 +0200
Corinna Vinschen wrote:
> Ouch!  I didn't realize that writev is not a required function on
> bare metal, sorry.
> 
> Takashi, we need a patch to implement perror/psignal without writev, for
> instance by calling write twice.  Care to send a followup patch?

Patch attached.

I am not sure whether _newlib_flockfile_start()/end() is necessary or not.
Could you please check?

-- 
Takashi Yano <takashi.yano@nifty.ne.jp>
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