[issue20666] asyncio/OpenBSD: make concurrent.futures dependency optional

[Guido van Rossum]

Guido van Rossum added the comment:

I'd prefer not to add a bad hack to support such a broken platform. If it doesn't have semaphores, not much Python code will run.

Maybe the dummy_threading module can be used instead?

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<http://bugs.python.org/issue20666>
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