SPOILER ALERT:  This story contains spoilers for “ Lord of the Flies ,” now streaming on Netflix. Fans of William Golding’s classic 1954 book “Lord of the Flies,” about a group of schoolboys stranded on a tropical island, will surely anticipate Piggy’s (also known as Nicky) death coming in the new four-part series from showrunner, writer and executive producer Jack Thorne. “In the book, he dies instantly. It’s a real shock. It comes out of nowhere and I think what Jack Thorne’s done rather