That’s some out-of-this-world dedication. Drew Barrymore learned on an upcoming episode of her TV show just how dedicated her “E.T. the Extra-Terrestrial” director Steven Spielberg was to keeping movie magic alive for the then-7-year-old actress. “Now I believed E.T. was real,” Barrymore, 47, tells co-stars Henry Thomas, Robert MacNaughton and Dee Wallace — who played her older brothers and mother in the film — in a sneak peek of the “The Drew Barrymore Show’s” Halloween episode on Monday, published by Entertainment Weekly. “I really, really loved him in such a profound way. … What would hap…