Fix crash in GC: PyTuple_SET_ITEM steals reference

Author: iakov

src/PythonQt.cpp

@@ -763,6 +763,7 @@ PyObject* PythonQtPrivate::createNewPythonQtEnumWrapper(const char* enumName, Py
   PyObject* className = PyString_FromString(enumName);
 
   PyObject* baseClasses = PyTuple_New(1);
+  Py_INCREF(&PyInt_Type);
   PyTuple_SET_ITEM(baseClasses, 0, (PyObject*)&PyInt_Type);
 
   PyObject* module = PyObject_GetAttrString(parentObject, "__module__");
@@ -2439,4 +2440,4 @@ PythonQtClassInfo* PythonQtPrivate::getClassInfo( const QByteArray& className )
 void PythonQtPrivate::registerLazyClass( const QByteArray& name, const QByteArray& moduleToImport )
 {
   _knownLazyClasses.insert(name, moduleToImport);
-}
+}