Use OCCT Handle macro for Handle_ classes

This is the result of running OCCT's upgrade script provided
with OCCT 7.0. See
https://www.opencascade.com/content/freecad-occt710-and-windows-rtti-data-missing#comment-form
and
https://www.forum.freecadweb.org/viewtopic.php?f=4&t=21405&start=120#p169019
for why this is necessary for OCCT >= 7.1

src/Mod/ReverseEngineering/App/AppReverseEngineering.cpp

@@ -221,7 +221,7 @@ private:
             }
 
             Reen::BSplineParameterCorrection pc(uOrder,vOrder,uPoles,vPoles);
-            Handle_Geom_BSplineSurface hSurf;
+            Handle(Geom_BSplineSurface) hSurf;
 
             if (uvdirs) {
                 Py::Tuple t(uvdirs);