[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

> I just looked at the test-collections patch and don't want it
> committed.  It is full of trivial edits that make it hard to
> review and doesn't make the test suite better.

Thanks for the feedback, Raymond.  I agree that there are a number of trivial edits there that shouldn't be there.  I'll fix those.

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