[Distutils] Provisionally accepting PEP 517's declarative build system interface

[Donald Stufft]

The hook is also so a tool like tox or TravisCI or twine can produce a sdist that can be uploaded to PyPI or similar. 

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> On May 31, 2017, at 11:16 AM, Paul Moore <p.f.moore at gmail.com> wrote:
> 
> Hmm. The proposed API (whether it's "create a sdist" or "tell me what
> files to copy") is intended so that a frontend can use the following
> process:
> 
> 1. Create a temp directory
> 2. Call a hook to get the "source"
> 3. Put the source in the temp directory (unpack, copy, ask the hook to
> put the files in here directly, whatever)
> 4. Call the "build wheel" hook on the temp directory