Only perform special TLS handling if TLS has been configured

Skip over special TLS steps for stream ciphers if we haven't been
configured for TLS.

Fixes #12528

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/13774)