[issue24316] Fix types.coroutine to accept objects from Cython

[Yury Selivanov]

Yury Selivanov added the comment:

Please test the attached patch.

> BTW, it's not only for compiled generators but also for normal Python functions that construct Python generators internally and return them

You're right, that's why I used "primarily" word in that comment ;) 

types.coroutine() is only used by asyncio.coroutine() so far, and returning generator objects from "factory" functions isn't a very common pattern in asyncio.

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Added file: http://bugs.python.org/file39551/types_coroutine.patch

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