[Distutils] Simplify 426: Deprecate Author-email and Maintainer-email

[Nick Coghlan]

I plan to reject PEP 390, since that feature won't be added to the stdlib.

The reason we will need at least a minimal replacement for it is so that
there's a standard place to define and retrieve the archiver hook that
creates the sdist (and hence pymeta.json) from a source tarball or VCS
checkout (as well as determine the necessary dependencies for that step).

My reason for wanting to flesh out a more comprehensive pymeta.cfg spec,
though, is as a sanity check on the proposed PEP 426 metadata. If I can't
come up with a clean multi-file input format, then I will be highly
suspicious of the underlying data model.

Cheers,
Nick.
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