Added PortAudio patches for fixing compilation errors in Snow Leopard

Ignore-this: 1670e0325f4afa34017d81b45ac10c8f

darcs-hash:20091120143400-56b4d-e40532566ccedfedacd5e9a372c7413b9d107efd
Update Install.osx including Snow Leopard instructions

Ignore-this: b964ab268d89a672cf5e0031062b17b5

darcs-hash:20091123093937-56b4d-c3cb01d499a34d996dacc3e9dcaa83409d6471e3