[issue26981] add compatibility shim for enum34 backport

[Roundup Robot]

Roundup Robot added the comment:

New changeset 10830e1b2966 by Ethan Furman in branch 'default':
issue26981: add _order_ compatibility shim to enum.Enum
https://hg.python.org/cpython/rev/10830e1b2966

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nosy: +python-dev

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<http://bugs.python.org/issue26981>
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