Remove use of `distutils` from `setup.py`

[t20100]

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distutils is depracated and will be removed in Python 3.12 PEP 632, we should get rid of it.

[t20100]

After PR #3585, remaining distutils usage will be:

• from distutils.command.clean import clean: Inherited to remove .c, .cpp files generated by Cython
• from distutils.command.build import build: Inherited to pass options for force_cython and use_openmp. Those options are used by build_ext and not build, so they could be moved to build_ext instead (which comes from setuptools) and/or provided as environment variable (even if env. var. are not self-documented, but passing options through pip's --global-option is cumbersome).