SAN JOSE, Calif. — Gonzaga guard Jordan Mathews scored 13 points and made three 3-pointers, the last with 57.3 seconds remaining to help the Bulldogs secure a 61-58 victory over West Virginia in the NCAA Tournament West Region semifinals at the SAP Center on Thursday. Mathews’ 3-pointer made it 60-58, and Silas Melson sank a free…