Youth commands that all must endure a Smiths phase. If it was not you yourself who, at one point, attended the church of Morrissey, then at least a family member or someone close to you did. Stephen Chbosky, author of “The Perks of Being a Wallflower†recognizes this post-1982 rite and fully integrated in to his own screen adaptation, with the story’s principals fledgling through high school and exchanging mixtapes in the meanwhile.