Switch from distutils to setuptools/sysconfig

[adrianeboyd]

Description

Additionally remove outdated is_new_osx check and settings.

Types of change

?

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[svlandeg]

Thanks for taking care of all of these!

[adrianeboyd]

For the is_new_osx thing, there is a slight possibility that someone might complain that it breaks something, but we don't have any good way to test it at this point. We could consider adding it back in (also for a new other packages, but with the platform.mac_ver() check from spacy instead of distutils.util.get_platform() that's in a few other places).