CHICAGO — Sustained close friendships take work, especially for men. They’re invariably fragile relationships, easily destroyed by inattention, jealousy, inequalities of wealth and success (or one party’s perceptions thereof), or mutual lack of care. And that’s just the internal stuff: many close pals have been driven apart by external affairs like politics or race or merely that which comes down at the office. Rajiv Joseph’s “King James” tells a very moving, accessible and openhearted story of two friends in Cleveland who bond and come unstuck over the rise (and subsequent exit and return) of…