Allow using -SSLv2 again when setting Protocol in the config.
Allow using -SSLv2 again when setting Protocol in the config.

RT#3625

Reviewed-by: Emilia Käsper <6521fc25e7624eef7c3a0d89b71de7e612d27d37@openssl.org>

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl