Photo-Illustration: Vulture; New Line Cinema/Everett Collection If you’re even passingly familiar with slasher movies, you know that the villains never really die. But when an iconic killer has been MIA for a decade and a half, you do start to wonder. It has indeed been 15 years since we last saw Freddy Krueger and an even longer 22 years since the Freddy we know and love — the version Robert Englund played in eight of the nine Nightmare on Elm Street films — has popped up on our screens. He’s