WARSAW, Oct 3 (Reuters) - Polish troops in Iraq have found four French-built advanced anti-aircraft missiles which were built this year, a Polish Defence Ministry spokesman told Reuters on Friday. France strongly denied having sold any such missiles to Iraq for nearly two decades, and said it was impossible that its newest missiles should turn up in Iraq. "Polish troops discovered an ammunition depot on September 29 near the region of Hilla and there were four French-made Roland-type missiles," Defence Ministry spokesman Eugeniusz Mleczak said. "It is not the first time Polish troops found ammunition in Iraq but to our...