You might recognize Hugh Skinner from “Mamma Mia! Here We Go Again,” where he played the younger version of Colin Firth’s Harry. Or you might recognize him from “Fleabag,” where he played one of the main character’s ex-boyfriends, also named Harry. But Skinner is perfect to play Harry Cameron in “The Seven Husbands of Evelyn Hugo,” not just because he often plays guys named Harry. Skinner brings a goofy, light quality to his work. And like Harry Cameron, Skinner is gay.