‘Real Niggas’ Don’t Die BY CLARENCE BARR, II       The celebration started with more than a minute remaining in the fourth quarter of the NBA Finals on Monday night. It began innocently enough with a Golden State Warriors fan sitting near me mockingly singing the tune, “NAH-NAH-NAH-NAH….NAH-NAH-NAH-NAH….HEY-HEY-HEY….GOODBYE.” Then, as the clock ticked closer…