The Bronx DA's office says an 83-year-old engineer lied about using steel in a building that caught fire and collapsed and left two firefighters dead in 2006. Jose Vargas, who pleaded not guilty, was arraigned in court yesterday. The three-alarm fire broke out at a 99-cent store on Walton Avenue on August 27, 2006; the building's roof and first floor collapsed, killing Lieutenant Howard Carpluk Jr. and firefighter Michael Reilly. Vargas, who signed inspection papers......