[issue24881] _pyio checks that `os.name == 'win32'` instead of 'nt'

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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nosy: +haypo, serhiy.storchaka
versions:  -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24881>
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