[Patch] Fix libstdc++/11378 (3rd take)

[Paolo Carlini]

Hi,

this is the 3rd try: in this case I have added an autoconf
test for writev, which is then used when available, as per
Nathan's indication.

I would really like to have this in and close 11378 once
and for all.

Tested x86-linux

Paolo.

P.S. As soon as basic_file_stdio has settled a bit I shall
properly qualify the various sys calls with ::.
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