Fix enable-weak-ssl-ciphers

Commit e260bee0 broke the enable-weak-ssl-ciphers option. The stitched
rc4-hmac-md5 cipher implementation did not recognise the tls_version
parameter, and therefore was being incorrectly handled.

Fixes #13795

Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
Reviewed-by: Ben Kaduk <kaduk@mit.edu>
(Merged from https://github.com/openssl/openssl/pull/13803)