The mere notion that any movie studio would not want Robert Redford in their movie is vaguely insane these days, given the titanic figure the actor and Sundance Film Festival founder became in American cinema. However, in his early days of nascent stardom, that’s precisely what happened with one of his films. Amazingly, the movie in question featured arguably the most defining role in Redford’s career, and the studio only relented when his older…