[Distutils] Accepting PEP 470 - Removing External Hosting support on PyPI

[Paul Moore]

There has been no further feedback on PEP 470, and Donald has
incorporated all the feedback, so I'm happy to announce that I am
approving it.

The PEP is available in the usual place at
https://www.python.org/dev/peps/pep-0470/.

Thanks to all who participated in the various threads on the subject,
and to Donald for writing the PEP and updating it to reflect all of
the extensive feedback.

Cheers,
Paul