0030611: Coding Rules - eliminate GCC compiler warnings -Wcatch-value

Add missing const& to catch statements.

src/TPrsStd/TPrsStd_ConstraintTools.cxx

@@ -2179,7 +2179,7 @@ void TPrsStd_ConstraintTools::ComputeRound(const Handle(TDataXtd_Constraint)& aC
        }
      }
    }
-   catch(Standard_Failure) {
+   catch(Standard_Failure const&) {
      ais.Nullify();
    }
  }