His portrayal of Lola in “Kinky Boots,” put Chiwetel Ejiofor on the map, then his astonishing performance in “12 Years A Slave" made him a household name. Roles in “The Martian,” “Doctor Strange,” and the under-appreciated “Z for Zachariah” followed. Now he has written, directed and stars in “The Boy Who Harnessed The Wind.” He talks about the art of wearing many hats, directing the extremely gifted young Maxwell Simba in his first film role, and the effort he took to not shortchange