PARIS — Veteran British director Ken Loach has won his second Palme d'Or at the Cannes Film Festival Sunday for "I, Daniel Blake" — a stark and polemical portrayal of a disabled man's struggle with the benefits system in gritty northern England. The 79-year-old was presented the festival's top prize by actor Mel Gibson at a ceremony on the French Riviera. Accepting the award, the silver-haired...