App: modernize C++: use override

src/App/FeaturePythonPyImp.h

@@ -89,14 +89,14 @@ public:
 
 public:
     explicit FeaturePythonPyT(Base::BaseClass *pcObject, PyTypeObject *T = &Type);
-    virtual ~FeaturePythonPyT();
+    ~FeaturePythonPyT() override;
 
     /** @name callbacks and implementers for the python object methods */
     //@{
     static  int __setattro(PyObject *PyObj, PyObject *attro, PyObject *value);
     //@}
-    PyObject *_getattr(const char *attr);              // __getattr__ function
-    int _setattr(const char *attr, PyObject *value);        // __setattr__ function
+    PyObject *_getattr(const char *attr) override;
+    int _setattr(const char *attr, PyObject *value) override;
 
 protected:
     PyObject * dict_methods;