Throughout Marcel Khalifé’s concert at Berklee Performance Center Saturday night, his deep connection with the audience was palpable. That’s because Khalifé, an oud master, singer, and composer, is more than a musical icon. Born into a Lebanese Christian family, Khalifé is renowned throughout the Arab world for songs of yearning, love, struggle, and the desire for peace and justice. Saturday night’s concert was titled “Fall of the Moon: An Homage to Palestinian Poet Mahmoud Darwish, and a Salute to the Arab Spring.”