Using the openldap c api

We are in the throw of migrating to openldap however we have a problem.

we currently have the 2.4 release of the client libraries.

I have a problem in the mean time. we have a ldap repository that does not support TLS but only supports the SSL v1.3 standard .....yes I know about the security risks that's why we are migrating. Currently the Old Mozilla C api is in use which I have to replace.

From looking at the 2.4 API docs would I be correct in saying the API does not support SSL v1.3 ? Would the Deprecated API calls get me over the line in replacing the mozilla and establishing a SSL connection, Or should I look at going to an older openldap API version?

Thanks Matt