A South African court pushed back to September 21 and 22 a hearing scheduled for Thursday in a corruption trial of former president Jacob Zuma linked to a 1990s arms deal. The 12-day postponement was agreed between Zuma's lawyers and prosecutors and granted by Judge Piet Koen at the Pietermaritzburg High Court. It is the latest in a series of delays in the long-running case, in which 79-year-old Zuma faces multiple charges including corruption, racketeering and money laundering over the weapons contract over which he allegedly received kickbacks. Zuma was jailed for 15 months in July for defying a constitutional…