Remove rectify_client_ciphers as needless.

We previously used this function instead of SSL_set_cipher_list() to
set up a stack of client SSL_CIPHERs for these reasons:

  A) In order to force a particular order of the results.

  B) In order to be able to include dummy entries for ciphers that
     this build of openssl did not support, so we could impersonate
     Firefox harder.

But we no longer do B, since we merged proposal 198 and stopped
lying about what ciphers we know.

And A was actually pointless, since I had misread the implementation
of SSL_set_cipher_list().  It _does_ do some internal sorting, but
that is pre-sorting on the master list of ciphers, not sorting on
the user's preferred order.