Remove SSL_CIPHER_get_by_{id,value}()

Remove SSL_CIPHER_get_by_{id,value}()

While this undocumented API would have been much nicer and saner than
SSL_CIPHER_find(), nothing used this except for the exporter test.
Let's get rid of it again. libssl uses ssl3_get_cipher_by_{id,value}()
directly.

ok jsing