Use setuptools instead of distutils

Prompted by: https://bugzilla.redhat.com/show_bug.cgi?id=2154976
Notes: https://peps.python.org/pep-0632/#migration-advice
       https://bugs.python.org/issue41282#msg393017

I tested this with python3 (package built and installed, a test "crash" gets
reported in the journal as expected), but not with python2, except for syntax
correctness.

Author: keszybz

setup.py

@@ -1,14 +1,14 @@
 # -*- coding:utf-8 -*-
+import site
 import sys
-from distutils.core import setup
+import sysconfig
+from setuptools import setup
 
 if '--user' in sys.argv: # There must be a better way to do this,
                          # if you know it, please tell me.
-    import site
     packages_path = site.getusersitepackages()
 else:
-    from distutils import sysconfig
-    packages_path = sysconfig.get_python_lib()
+    packages_path = sysconfig.get_path('purelib')
 
 version = '1'