py-setuptools: update to 42.0.1.

v42.0.1
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* #1918: Fix regression in handling wheels compatibility tags.

v42.0.0
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* #1830, #1909: Mark the easy_install script and setuptools command as deprecated, and use `pip <https://pip.pypa.io/en/stable/>`_ when available to fetch/build wheels for missing ``setup_requires``/``tests_require`` requirements, with the following differences in behavior:
  * support for ``python_requires``
  * better support for wheels (proper handling of priority with respect to PEP 425 tags)
  * PEP 517/518 support
  * eggs are not supported
  * no support for the ``allow_hosts`` easy_install option (``index_url``/``find_links`` are still honored)
  * pip environment variables are honored (and take precedence over easy_install options)
* #1898: Removed the "upload" and "register" commands in favor of `twine <https://pypi.org/p/twine>`_.
* #1767: Add support for the ``license_files`` option in ``setup.cfg`` to automatically
  include multiple license files in a source distribution.
* #1829: Update handling of wheels compatibility tags:
  * add support for manylinux2010
  * fix use of removed 'm' ABI flag in Python 3.8 on Windows
* #1861: Fix empty namespace package installation from wheel.
* #1877: Setuptools now exposes a new entry point hook "setuptools.finalize_distribution_options", enabling plugins like `setuptools_scm <https://pypi.org/project/setuptools_scm>`_ to configure options on the distribution at finalization time.

(wiz)