[Distutils] PEP 517 again

[Daniel Holth]

I don't think this is a big deal. Compatibility is a guess, wheel tags do
not and are not intended to guarantee compatibility especially when the
wheel was built locally for caching purposes and not intentionally
published. Anything can happen during a build. PEP 517 won't change this.

So right now pip has an odd way of segregating its wheel cache per
interpreter that involves obscure setup.py arguments. That can be fixed
without re-tagging or asking the build system to re-tag wheels or otherwise
interacting with the new PEP.
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