[Patch] Fix the second part of libstdc++/13731

[Paolo Carlini]

Hi again everyone,

this is the second part. I have also moved both xwrite and xwritev
inside __gnu_internal, static: there is no reason to expose those
two implementations, which, in principle, could well be provided
by the OS, similarly to write/writev.

If it's ok with you I will apply this one too to mainline and
wait a few days...

Tested x86-linux.

Paolo.

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