add cython build dependency for implementations other than pypy, cpython #1986
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ensures backend dependencies span implementations, rather than leaving them both out for unknown implementations
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rather than only specifying a build dependency on cpython and pypy, use pypy or not pypy.
It' unclear if CFFI is more likely to work for other backends? Who knows! But this matches longstanding behavior where Cython is used "unless pypy", now the dependency matches the internal logic.
closes #1984 (confirmed with
docker run pyston/pyston pip install pyzmqandpip install .with this branch)