A man who spent real money to buy virtual “gold” while playing “Game of War” doesn’t have a case against the video game’s producer, a federal judge held.In a written opinion, U.S. District Judge Robert M. Dow Jr. threw out the class-action lawsuit that Mihajlo Ristic filed against Machine Zone Inc.Machine Zone operates “Game of War,” which is available on mobile devices on Android and Apple platforms.Dow rejected the argument Monday that Machine Zone violated the Illinois …