[issue4856] Remove checks for win NT

[Hirokazu Yamamoto]

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

Oops, sorry. This function is not needed if GetFileAttributesEx never
fail with ERROR_CALL_NOT_IMPLEMENTED. I believe this won't happen on win
NT. How about this patch?

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Added file: http://bugs.python.org/file14381/remove_unused_function.patch

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