Whatever charms turned the musical “Jersey Boys” into a Tony-winning Broadway hit are sorely missed in Clint Eastwood’s tone-deaf corpse of a movie. Late to the game, blandly cast and scripted with every Italian-American cliche, it is Eastwood’s worst film as a director. And it does Frankie Valli and the Four Seasons no great favors either, overselling their cultural significance, rendering their story in broad, tried and trite strikes.