[issue1330] Fix truncate on Windows, this time for real

[Christian Heimes]

Christian Heimes added the comment:

> While I like fixing the position restore in _fileio.c, I also liked
> Amaury's flush() call in _BufferedIOMixin.  Perhaps you can keep that
> part (while losing the position restore)?

Good point. We have to call flush() in _BufferedIOMixin as you said. I
checked if I could add a flush call to _fileio but it makes no sense. We
are working on file descriptors which means we don't have to use
fflush() and FileIO's flush() is a NOOP.

Added file: http://bugs.python.org/file8615/py3k_win_io2.patch

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