[issue19700] Update runpy for PEP 451

[Nick Coghlan]

Nick Coghlan added the comment:

I added some unit tests for the interactions between runpy and namespace packages, which showed that I was doing the check for __main__ submodules and the check for "no loader" in the wrong order.

Last missing piece is to ensure that __spec__ is being populated appropriately, then I'll check this in.

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Added file: http://bugs.python.org/file33132/issue19700_runpy_spec_v2.diff

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