Fix clang compiler warnings:

+ fix -Winconsistent-missing-override
+ fix -Wpessimizing-move (Geometry::clone: moving a temporary object prevents copy elision -> remove std::move call here)

src/Mod/Part/App/AppPartPy.cpp

@@ -520,7 +520,7 @@ private:
         }
     }
 
-    virtual Py::Object invoke_method_varargs(void *method_def, const Py::Tuple &args)
+    virtual Py::Object invoke_method_varargs(void *method_def, const Py::Tuple &args) override
     {
         try {
             return Py::ExtensionModule<Module>::invoke_method_varargs(method_def, args);