WINSTON-SALEM, N.C. — The highest ranking female firefighter in Asheville, N.C., says she was repeatedly discriminated against because of her sex and fought to keep her job while battling breast cancer. The first female chief of a municipal fire department in the state says she briefly pondered suicide after years of sexual harassment.Joy Ponder and Susanna Schmitt Williams are among numerous female fighters in the United States who have filed lawsuits against their employers alleging they were subjected to demeaning …