The “Howard Stern Show” fantasy football league is now “defunct” after nearly two decades. Michael Rapaport revealed the long-running segment had been quietly canceled in a Thursday podcast episode. “It’s done,” the comedian, 56, told “I Am Rapaport” listeners while mourning “one of the greatest … [and] most famous fantasy football leagues.” He explained, “They just can’t do it anymore.” Fantasy football, notably, is set to start Wednesday when the NFL’s season kicks off, with most drafts taking place in late August or early September. Rapaport recalled, “I took that [league] from the bottom to the top, made it a viral sensation that…