[issue19635] asyncio should not depend on concurrent.futures, it is not always available

[STINNER Victor]

STINNER Victor added the comment:

> Who would be using such an old FreeBSD version anyway (while wanting to use a bleeding edge Python version and the bleeding edge asyncio package)?

If we want to drop support of old FreeBSD versions, something can be done using the PEP 11. We have FreeBSD 6.4 and 7.2 buildbots. I'm trying to fix all buildbots.

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