tempfile: Delegate tempdir::new
to base version
#360
Merged
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I was looking at the code here for an unrelated reason, and realized that there's no reason for us to duplicate the code.
Because a Dir instance doesn't have a name accessible to the calling code, we just delegate to the non-UTF8 base version. In some presumably very unusual situations the tempdir may have a non-UTF8 name, but that's fine.