The building materials business now known as Mannok has been through something of a tumultuous 13 years or so. The Fermanagh-based firm was once part of Sean Quinn’s business empire before a failed bet on Anglo Irish Bank dragged him into bankruptcy and subsequently forced him to surrender control of his businesses in 2011. The company re-emerged as Quinn Industrial Holdings in 2014 when a consortium of local businessmen, armed with capital from a trio of American hedge funds in the form of Brigade Capital, Silver Point, and Contrarian, brought the business out of receivership. Five years later, it was…