Hugh Masekela, courtesy. Internationally acclaimed trumpeter, flugelhornist and composer Hugh Masekela never chose to be the musical voice of a defiant South Africa. Hugh Masekela and Vusi Mahlasela 8 p.m. March 11 Zellerbach Auditorium, UC Berkeley Tickets: $30-$72. “I was just a musician, making a living. And it was…