PartDesign/FeaturePrimitive: suppress a -Woverloaded-virtual warning

src/Mod/PartDesign/App/FeaturePrimitive.h

@@ -60,6 +60,10 @@ public:
     /// The references datum defining the primtive location
     App::PropertyLink CoordinateSystem;
     
+    /// Do nothing, just to suppress warning, must be redefined in derived classes
+    virtual App::DocumentObjectExecReturn* execute() {
+        return PartDesign::FeatureAddSub::execute();
+    };
 protected:
     //make the boolean ops with the primitives provided by the derived features
     App::DocumentObjectExecReturn* execute(const TopoDS_Shape& primitiveShape);