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pitrou's patch changes PyFile_FromFd() behaviour for a text file 
opened with buffering=0:
 /* As a convenience, when buffering == 0 on a text file, we
 open the underlying binary stream in unbuffered mode and
 wrap it with a text stream in line-buffered mode. */
Why changing PyFile_FromFd() and not io.open() directly?
Note: I prefer Py_UnbufferedStdoutFlag=1 instead of 
Py_UnbufferedStdoutFlag++ (for -u command line option).
Except the minor comments, I like the patch (and it has unit 
tests!) ;-)