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Not only does the new Vampire Weekend video “Sunflower” showcase Zabar’s and Barney Greengrass — two Upper West Side institutions — but it features two iconic New Yorkers: Jerry Seinfeld and Fab 5 Freddy. “That’s kinda dope,” says Freddy (real name: Fred Brathwaite), a hip-hop pioneer who rose to fame as the host of “Yo!...