An employee demonstrates a durability test for Gorilla Glass at a Corning Inc. facility in Corning, New York.Photographer: Victor J. Blue/BloombergCorning Inc. has avoided the threat of European Union antitrust fines, after it agreed to end exclusivity terms in its supply contracts for break-resistant smartphone screens that the watchdog deemed to be anticompetitive. The European Commission said in a statement on Friday that the US glass firm had agreed to “waive all exclusive dealing clauses in...