Al Pacino took a busman’s holiday the other night. The actor, who plays Shylock in the Shakespeare in the Park production of “The Merchant of Venice,” sneaked into the Delacorte Theater to see “The Winter’s Tale” and to support his fellow cast members including Jesse L. Martin, “Modern Family” star Jesse Tyler Ferguson, Hamish Linklater and Marianne Jean-Baptiste who are all appearing in both shows as part of the summer repertory season.