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>
(cherry picked from commit 8be493744cafc2572c701e681ab147fa28c6bc39)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/108719
Reviewed-by: David Ostrovsky <david@ostrovsky.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
diff --git a/pyuno/source/loader/pyuno_loader.cxx b/pyuno/source/loader/pyuno_loader.cxx
index 07dc748..dc428fb 100644
--- a/pyuno/source/loader/pyuno_loader.cxx
+++ b/pyuno/source/loader/pyuno_loader.cxx
@@ -229,7 +229,9 @@ PythonInit() {

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

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