Remove DSA_generate_parameters

Remove DSA_generate_parameters

This was deprecated in 0.9.8 and used until recently by rust-openssl
and by keynote (keynote has the excuse that it was written before the
deprecation). Fortunately Paul Kehrer fixed this in rust-openssl,
so we can garbage collect this turd. (It was replaced with the less
ergonomic DSA_generate_parameters_ex() to expose a new fancy way of
displaying dots, stars and pluses on key generation).

ok jsing