[issue6215] Backport the IO lib to trunk

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

I think I could fix windows build issue. (r73423)

It seems some tests are failing. See
http://www.python.org/dev/buildbot/trunk.stable/x86%20XP-4%20trunk/builds/2244/step-test/0

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nosy: +ocean-city

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