When “Dune: Part Two” star Stellan Skarsgård saw Austin Butler as the cruel and sadistic Feyd-Rautha for the first time, he laughed. “I laughed so much because it was so obvious that he really enjoyed being evil,” Skarsgård told Variety at the “Dune: Part Two” premiere Sunday night in New York City. Butler’s Feyd-Rautha is …