[issue8879] Implement os.link on Windows

[Hirokazu Yamamoto]

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

r86733 introduces st_ino setup in attribute_data_to_stat(),
but Fild ID is not guaranteed to be same when file is not opened.
So I think it's meaningful only for os.fstat().

Please see
http://msdn.microsoft.com/en-us/library/aa363788%28v=VS.85%29.aspx

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