[issue7566] Add ntpath.sameopenfile support for Windows

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

As NTFS supports hard links, I think GetFileInformationByHandle should
be used to compare handles (looking at dwVolumeSerialNumber,
nFileIndexHigh,nFileIndexLow)

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nosy: +loewis

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