Photo: Andreas Rentz/Getty Images At Tuesday night’s Cannes Film Festival opening gala, Leonardo DiCaprio presented his friend and co-star Robert De Niro with the Honorary Palme d’Or. “The thing about Bob is, he doesn’t say much, but when he does, it matters,” said DiCaprio. “If I’m lucky, I’ll get a nod from him tonight, maybe even a half-smile, and I will take that as a standing ovation.” Everyone laughed good-naturedly. On Wednesday, the festival hosted a “Rendezvous with Robert De Niro,”