PORT-AU-PRINCE, HAITI — A contingent of security forces from Guatemala and El Salvador arrived in Haiti’s capital Friday to reinforce a long-delayed United Nations-backed mission tasked with restoring security amid a bloody conflict with armed gangs. The new arrivals were made up of 75 Guatemalans and eight Salvadorans, a communications officer for the mission said. The president of Haiti’s transitional presidential council, Leslie Voltaire, alongside Prime Minister Alix Didier Fils-Aime and U.S. Ambassador Dennis Hankins, welcomed the troops at Port-au-Prince’s airport, Haiti’s interim government said in a post on social media. “They have come to reinforce the Multinational Force in