BENGHAZI, Libya—Libya’s top electoral body on Wednesday disqualified the son and onetime heir apparent of the late dictator Moammar Gadhafi from running for president in elections to be held next month, citing his previous convictions. The name of Seif al-Islam Gadhafi appeared on a list of ineligible candidates issued by the country’s High National Elections Committee. He can appeal the decision in court in the coming days. Seif al-Islam had been sentenced to death by a Tripoli court in 2015 for using violence against protesters in a 2011 uprising against his father, but that ruling has since been called into question by Libya’s rival authorities. He is also wanted by the International Criminal Court on charges of crimes against humanity related to the uprising. Libya is set to hold the first round of presidential elections on Dec. 24, after years of U.N.-led attempts to usher in a more democratic future …