Remove distutils fallback and outdated comment

setuptools includes a vendored version of pyparsing (and other
dependencies). They are not install through traditional tools.
Therefore, distutils is not required as fallback to facilitate
setuptools.

https://github.com/pypa/setuptools/blob/v40.6.3/setuptools/_vendor/pyparsing.py

The Python documentation recommends against using distutils:

https://docs.python.org/3/library/distutils.html

> Most Python users will not want to use this module directly, but
> instead use the cross-version tools maintained by the Python Packaging
> Authority. In particular, setuptools is an enhanced alternative to
> distutils that provides ...

Also remove the unused imports.

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