Comment 0 for bug 1873923

I created a git repo with the reproduction: https://github.com/gergelykalman/freeradius-python3-bug

Package version:
Version: 3.0.20+dfsg-3build1

The error message:
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Mon Apr 20 17:12:57 2020 : Debug: rlm_passwd: nfields: 3 keyfield 0(User-Name) listable: no
Mon Apr 20 17:12:57 2020 : Debug: # Instantiating module "python3" from file /etc/freeradius/3.0/mods-enabled/python3
Mon Apr 20 17:12:57 2020 : Info: Python version: 3.8.2 (default, Mar 13 2020, 10:14:16) [GCC 9.3.0]
Mon Apr 20 17:12:57 2020 : Warning: Libpython is not found among linked libraries
Mon Apr 20 17:12:57 2020 : Warning: Failed loading libpython symbols into global symbol table
Mon Apr 20 17:12:57 2020 : Error: do_python_single:568, instantiate - pRet is NULL
Mon Apr 20 17:12:57 2020 : Error: python_error_log:200, Exception type: <class 'SystemError'>, Exception value: null argument to internal routine
Mon Apr 20 17:12:57 2020 : Error: do_python_single:676, instantiate - RLM_MODULE_FAIL
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