Since we no longer need to support SSLv2-style cipher lists, start

Since we no longer need to support SSLv2-style cipher lists, start
unravelling the maze of function pointers and callbacks by directly
calling ssl3_{get,put}_cipher_by_char() and removing the
ssl_{get,put}_cipher_by_char macros.

Prompted by similar changes in boringssl.

ok guenther.