special casing importlib.machinery breaks PyPy

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Originally reported by: s3anj (Bitbucket: s3anj, GitHub: Unknown)

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In pkg_resources/init.py the import of importlib only succeeds on cpython breaking pip on PyPy.

# Avoid try/except due to potential problems with delayed import mechanisms.
if sys.version_info >= (3, 3) and sys.implementation.name == "cpython":
    import importlib.machinery as importlib_machinery
else:
    importlib_machinery = None

PyPy3 has a working importlib.machinery package

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• Bitbucket: https://bitbucket.org/pypa/setuptools/issue/487

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Invoke import on importlib.machinery directly. Access an attribute to force import in delayed-import environments. Fixes #487.

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Original comment by s3anj (Bitbucket: s3anj, GitHub: Unknown):

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Excellent!

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Original comment by jaraco (Bitbucket: jaraco, GitHub: jaraco):

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Turns out pypy3 2.4 doesn't have a complete importlib.machinery package. I had to make another commit, 11ef9534d735. Still, some tests fail on pypy3. Expect even more work will be needed to get full pypy3 compatibility.

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Original comment by s3anj (Bitbucket: s3anj, GitHub: Unknown):

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Thanks. I will continue to test against pypy3 3.2.x and the dev branch for pypy3 3.3.5 (where I discovered the above issue).