gh-98978: Fix Py_SetPythonHome(NULL) (#99066)

Fix use-after-free in Py_SetPythonHome(NULL), Py_SetProgramName(NULL)
and _Py_SetProgramFullPath(NULL) function calls.

Issue reported by Benedikt Reinartz.
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Victor Stinner 2022-11-03 18:34:32 +01:00 committed by GitHub
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commit b07f546ea3
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Fix use-after-free in ``Py_SetPythonHome(NULL)``,
``Py_SetProgramName(NULL)`` and ``_Py_SetProgramFullPath(NULL)`` function
calls. Issue reported by Benedikt Reinartz. Patch by Victor Stinner.