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/TechDraw/App/DrawViewPart.cpp

@@ -192,7 +192,7 @@ App::DocumentObjectExecReturn *DrawViewPart::execute(void)
             extractFaces();
         }
         catch (Standard_Failure) {
-            Handle_Standard_Failure e4 = Standard_Failure::Caught();
+            Handle(Standard_Failure) e4 = Standard_Failure::Caught();
             Base::Console().Log("LOG - DVP::execute - extractFaces failed for %s - %s **\n",getNameInDocument(),e4->GetMessageString());
             return new App::DocumentObjectExecReturn(e4->GetMessageString());
         }