[Distutils] deprecating pip install --target

[Jon Parrott]

Currently, Google App Engine recommends that users use "--target" to vendor
packages:
https://cloud.google.com/appengine/docs/python/tools/libraries27?hl=en#vendoring

Ostensibly we also support virtualenvs with only pure-python packages.

> Alternatively, it should be possible to *detect* the problem cases, so
> why not do that, and reject them? Effectively, reduce the scope of
> --target to pure-python wheels only.

This would be acceptable for the App Engine use case.
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