[Patch] Implement Matt's "recipe" (part2)

[Paolo Carlini]

Hi,

the below, which I'm finishing testing (OK on x86-linux), deals
with the long standing issue of __copy_streambufs also using
for efficiency protected members of basic_streambufs: again, I'm
replacing it with equivalent specializations for char/wchar_t and
a generic - simple but correct - version going through the public
interface.

If nobody disagree, I will further test it and commit before the
end of the day.

Paolo.

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