Though J.R. Smith is a Cowboys fan, he hopes the Giants sign his buddy, free agent receiver Victor Cruz, who is a courtside fixture at Knicks games. “I hope he does,’’ Smith told The Post before the Knicks’ 110-84 victory over the Raptors last night. “This is pretty much where he wants to be. I’m a Cowboys fan but I still root for him. It would be nice for him to stay home.’’ Smith admits it’s no done deal because of the complexity of the NFL cap.