tdf#138987 pyuno: PyEval_InitThreads is a no-op in Python 3.9

Change-Id: I220eecfa6aaf4d5cb12e3b4eacadf25843b41452
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108403
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
diff --git a/pyuno/source/loader/pyuno_loader.cxx b/pyuno/source/loader/pyuno_loader.cxx
index 3a7bfd5..0db6e63 100644
--- a/pyuno/source/loader/pyuno_loader.cxx
+++ b/pyuno/source/loader/pyuno_loader.cxx
@@ -223,7 +223,9 @@ void pythonInit() {

    // initialize python
    Py_Initialize();
#if PY_VERSION_HEX < 0x03090000
    PyEval_InitThreads();
#endif

    PyThreadState *tstate = PyThreadState_Get();
    PyEval_ReleaseThread( tstate );