By Jonathan Stempel NEW YORK (Reuters) – The top U.S. securities regulator on Tuesday sued the former head of a now-defunct British company for making a fraudulent bid to buy U.S. aerospace and defense company Textron Inc for about $13.8 billion. Melville ten Cate, 52, and his Xcalibur Aerospace Ltd, which claimed to produce high-speed unmanned aircraft systems, were “never positioned to make any legitimate offer for Textron,” the Securities and Exchange Commission (SEC) said in a complaint filed in Manhattan federal court. The regulator said ten Cate, a U.S. citizen then living in Europe, mad…