Propagate tlsext_status_type from SSL_CTX to SSL to allow OCSP stapling ...

This patch was authored by Joe Urciuoli.  This patch allows OCSP stapling to work with libcurl.  Applications that use libcurl with OpenSSL have access to the SSL_CTX reference, not the SSL reference.  Without this patch it's not possible to use OCSP stapling with TLS.