BuildRequire python3-setuptools explicitly
    
    They were only transitively brought by sphinx -> babel -> setuptools.
    
        + make PYTHON=/usr/bin/python3 build
        Traceback (most recent call last):
          File "/builddir/build/BUILD/python-systemd-235/setup.py", line 2, in <module>
            from setuptools import setup, Extension
        ModuleNotFoundError: No module named 'setuptools'
        Traceback (most recent call last):
          File "<string>", line 1, in <module>
        ModuleNotFoundError: No module named 'setuptools'
        /bin/sh: line 1: git: command not found
        /usr/bin/python3 setup.py build_ext
        Traceback (most recent call last):
          File "/builddir/build/BUILD/python-systemd-235/setup.py", line 2, in <module>
            from setuptools import setup, Extension
        ModuleNotFoundError: No module named 'setuptools'
        make: *** [Makefile:35: build] Error 1