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

[STINNER Victor]

STINNER Victor added the comment:

> Can you try this patch?

I don't have access to the buildbot. You may try the custom buildbot if you don't want to commit directly:
http://buildbot.python.org/all/builders/x86%20FreeBSD%206.4%20custom

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