[issue27959] Add 'oem' encoding

[Roundup Robot]

Roundup Robot added the comment:

New changeset 4e80a157ea66 by Steve Dower in branch 'default':
Revert #27959: ImportError within an encoding module should also skip the encoding
https://hg.python.org/cpython/rev/4e80a157ea66

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<http://bugs.python.org/issue27959>
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