Next month marks the 30th anniversary of “Raiders of the Lost Ark” and we’ll be looking back on that sparkling film with special features. Monday, an exclusive excerpt from “The True Adventures of the World’s Greatest Stuntman,” the just-published memoir by Vic Armstrong, the stunt coordinator and stunt double who Martin Scorsese has called “a legend in the film world.” Armstrong has portrayed James Bond, Superman and Flash Gordon – at least when the action was underway – but his signature screen success came while wearing a fedora in three Indiana Jones films…