Years before ‘Citizen Kane’, the legendary filmmaker directed an all-Black version of ‘Macbeth’ to raves from across the sociopolitical spectrum. It puts to shame the current, Musk-led controversy over Christopher Nolan’s casting of Lupita Nyong’o as Helen of Troy, writes Xan Brooks W hat’s the thing that is most putting you off Christopher Nolan ’s forthcoming $250m (£186m) adaptation of The Odyssey ? Is it the sandals, the boats, or the reported 172-minute running time? If the answer is the