It’s been awhile since we’ve heard anything from wacky Eli Roth. Turns out that’s because the Newton-bred director of Hollywood horror flicks “Cabin Fever” and “Hostel” is busy gearing up to shoot a cannibal pic called “The Green Inferno.” (It’s about a group of do-gooders who encounter cannibals when their plane goes down in the jungle.) Rather than making the movie on a Tinseltown backlot, Roth plans to shoot in a remote village up the Amazon River. The director told Movieline.com that during a recent scouting trip to the area, he recuited 200 native villagers to be extras, and none of them had ever seen a movie. To rectify the situation, he screened — not “Gone With the Wind” or “Rain Man” — but director Ruggero Deodato’s super explicit “Cannibal Holocaust.” How’d that go over? “The villagers thought it was the funniest thing they’d ever seen,” said Roth.