TROY — A late fourth-quarter rally and a near-perfect free throw performance lifted Goversville to a 76-72 double overtime upset win against Troy Sunday in a boys’ Section II Class A quarterfinal basketball game at Hudson Valley Community College.Gloversville scored the last eight points of the fourth frame to pull even at 56, and after both teams managed seven points in the first OT, the No. 8-seeded  Dragons outscored the top-seeded Flying Horses 13-9 in the next to earn a fourth straight semifinal berth.That second OT  included a 10-for-10 free throw performance, and a big 3 by Anthony Gray that…