Spoilers below for “It: Welcome to Derry.” Stephen King is weighing in on the terrifying return of Pennywise the Dancing Clown. The horror legend recently shared his thoughts on HBO’s “It: Welcome to Derry,” the new prequel series expanding the universe of his iconic 1986 “It” novel — and even he’s spooked. “I like ‘Welcome to Derry’ a lot,” King, 78, exclusively told The Post. “There are plenty of horrors and lots of surreal visuals. There’s a supermarket scare that sticks in my mind, complete

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