[issue19700] Update runpy for PEP 451

[Nick Coghlan]

Nick Coghlan added the comment:

Final review of the patch showed it *wasn't* quite done, it's still missing the "both __name__ and __spec__.name are configured in sys.modules" change that is needed to get more pickle friendly behaviour from __main__.

However, I wanted to commit this version to help unblock issue 19946.

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<http://bugs.python.org/issue19700>
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