CANNES — “The Embrace of the Serpent,” Colombian director Ciro Guerra’s visually rich, black-and-white adventure saga about the ravages of colonialism in the Amazon, won the top Art Cinema Award at the 47th Directors’ Fortnight at Cannes on Friday. A follow-up to Guerra’s 2009 Un Certain Regard entry, “The Wind Journeys,” “Embrace of the Serpent” (which...