What’s become of jazz protest? The question is old, but in an era of international emergency, it’s relevant. So poet Amiri Baraka, playwright Sonia Sanchez, Columbia professor Robert O’Meally, and trumpeter Cecil Bridgewater are discussing dissent in jazz — and maybe exercising it — when Lincoln Center hosts “Jazz and Social Protest” on March 18. But dissent against what? And why? How successfully the panelists address jazz activism, and prescribe a course for it, might depend on how clearly they consider Max Roach and Abbey Lincoln’s legacies…”