[issue11939] Implement stat.st_dev and os.path.samefile on windows

[Roundup Robot]

Roundup Robot added the comment:

New changeset 3738d270c54a by Brian Curtin in branch 'default':
st_dev/st_rdev should be unsigned long as dwVolumeSerialNumber, which it is set to, is a DWORD. This was fixed in #11939 and the overflow was mentioned in #10657 and seen by me on some machines.
http://hg.python.org/cpython/rev/3738d270c54a

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