fix vorbis compile error on Mac OS X 10.9 (without brew)
fix vorbis compile error on Mac OS X 10.9 (without brew)

chunying/gaminganywhere,yunyu-Mr/gaminganywhere,masterall/gaminganywhere,SUPENTA/gaminganywhere,chunying/gaminganywhere,masterall/gaminganywhere,masterall/gaminganywhere,yunyu-Mr/gaminganywhere,SUPENTA/gaminganywhere,sylvain121/gaminganywhere,masterall/gaminganywhere,sylvain121/gaminganywhere,justusbeyer/gaminganywhere,justusbeyer/gaminganywhere,sylvain121/gaminganywhere,chunying/gaminganywhere,yunyu-Mr/gaminganywhere,sylvain121/gaminganywhere,yunyu-Mr/gaminganywhere,chunying/gaminganywhere,justusbeyer/gaminganywhere,justusbeyer/gaminganywhere,sylvain121/gaminganywhere,sylvain121/gaminganywhere,SUPENTA/gaminganywhere,SUPENTA/gaminganywhere