By Silvia Aloisi PARIS (Reuters) -France’s third biggest bank, Societe Generale, said on Friday investment banking boss Slawomir Krupa had been chosen by the board to become its next chief executive, succeeding veteran banker Frederic Oudea who is due to step down next year. The bank said in a statement the board had chosen Krupa unanimously at the end of a selection process which included internal and external candidates. “He has perfect knowledge of our bank, as well as the challenges that await him; he has demonstrated his ability to lead Societe Generale, a major European bank,” the bank’s…