fixed compile bug for when threads are turned off

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@13947 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/src/helpers.cpp

@@ -223,11 +223,13 @@ PyObject* __wxStart(PyObject* /* self */, PyObject* args)
 
 void __wxCleanup() {
     wxEntryCleanup();
+#ifdef WXP_WITH_THREAD
     delete wxPyTMutex;
     wxPyTMutex = NULL;
     wxPyTStates->Empty();
     delete wxPyTStates;
     wxPyTStates = NULL;
+#endif
 }