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Prevent `ValueError: I/O operation on closed file.`

when using `ZPublisher.HTTPRequest.FileUpload` in Python 3.

This happened before because Python 3 seems to garbage collect objects earlier
than Python 2 and FieldStorage was no longer referenced after storing its file
on the `FileUpload` instance. But `FieldStorage` closed its file in its
`__del__` method.

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