Added instructions to INSTALL.osx to manually compile gnutls and its dependencies, in order not to depend on fink

darcs-hash:20081212140708-58103-6e92c3b4893164225c5d30c6058fd18b73493c01
Added missing step to install updated eventlet

darcs-hash:20081212143342-58252-0e1ff26b11d0f74a00db23e7bc65f84d090d5486