[Patch 3.3] Move over Nathan's __copy_streambufs rewrote

[Paolo Carlini]

Hi,

a couple of days ago I answered privately an email,
writing that for 3.3 __copy_streambufs was fixed and a few
problems present in 3.2.3 were not present anymore.

This is indeed the case, but, OTOH, it's **so** ugly!

If nobody objects, I would like to move over Nathan's
rewrote. Tested x86-linux. Besides, I'm pretty sure that it
doesn't rely on any other mainline fix.

Paolo.

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