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/Part/App/PartFeature.cpp

@@ -83,7 +83,7 @@ App::DocumentObjectExecReturn *Feature::recompute(void)
         return App::GeoFeature::recompute();
     }
     catch (Standard_Failure) {
-        Handle_Standard_Failure e = Standard_Failure::Caught();
+        Handle(Standard_Failure) e = Standard_Failure::Caught();
         App::DocumentObjectExecReturn* ret = new App::DocumentObjectExecReturn(e->GetMessageString());
         if (ret->Why.empty()) ret->Why = "Unknown OCC exception";
         return ret;