Fix initialization of the python interpreter. This was causing runtime SEGV in tde-guidance

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>

src/pythonize.cpp

@@ -42,8 +42,12 @@ Pythonize::Pythonize ()
 
     if (!Py_IsInitialized ())
     {
-        PyEval_InitThreads ();
+        Py_Initialize();
-        Py_Initialize ();
+
+#if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION <= 6
+        // initialize thread support
+        PyEval_InitThreads();
+#endif
         if (!Py_IsInitialized ())
         {
             pythonInit = 0;
@@ -51,9 +55,6 @@ Pythonize::Pythonize ()
         }
 
         if (debug) printf ("Python interpreter initialized!\n\n");
-
-        // free the lock
-        PyEval_ReleaseLock();
     }
 }