“Writing,” Pulitzer Prize-winning playwright, screenwriter, and director David Mamet told Bill Maher on Friday’s Real Time, “is just making shit up.” Mamet has made a successful career of that, creating such plays as Glengarry Glen Ross and Speed-the-Plow, and writing/directing such films as Heist, Wag the Dog and Hannibal, among others. Now, he’s out with