[issue28428] Rename _futures module to _asyncio

[INADA Naoki]

INADA Naoki added the comment:

I found _futures module is not used on Windows for now (without this patch).
Because `{"_future", PyInit__future},` is not in PC/config.c

But, when it added, test_windows_events cause infinite loop.
This should be another issue.

With this (asyncio-speedups2.patch), build on Windows succeeds,
and test succeeds (without speedup enabled).

I want to apply this patch before fixing the issue and adding _asyncio to PC/config.c
Is it OK?

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<http://bugs.python.org/issue28428>
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