That’s what friends are for. Steven Spielberg has revealed that his late pal Robin Williams called him every week to cheer him up while he was filming his 1993 Holocaust movie, “Schindler’s List.” Spielberg’s friendship with Williams stretched back to “Hook,” the 1991 flick that Spielberg directed and featured Williams as an adult Peter Pan. 7 Julia Roberts (from left), Steven Spielberg and Robin Williams on the set of “Hook” in 1991. Getty Images 7 Steven Spielberg directs Robin Williams in “Hook.” Williams played an adult Peter Pan. Sygma via Getty Images Spielberg opened up about “Schindler’s List,” and several...