DUVALL,SI -- SPIELBERG NO! By Don Feder . There aren’t many people in Hollywood with the guts to take on a heavyweight like Steven Spielberg. That makes Robert Duvall part of an elite – showbiz types with courage and a conscience. In a recent interview with Charlie Rose, the man who played Lt. Col. Kilgore in “Apocalypse Now” gave the director of “Saving Pvt. Ryan” a little verbal napalm in the morning. Commenting on Spielberg’s 2002 trip to Cuba, Duvall innocently remarked: “Now I want to ask him (Spielberg) – and I know he’s going to get pissed off –...