Chris, in my opinion "cleared to land runway 04L, caution runway 04R is closed" may actually create more of a potential for misunderstanding with say a busy crew as the last verbal reference is 04R. I would stick with a clear and positive landing clearance for the runway concerned. If you really want to add to the clearance then go for "Runway 04L cleared to land runway 04L". I would avoid mentioning any other runway in the same transmission.