openssl: Add lws ctx ref to client vhost's SSL_CTX

Adds a reference to the libwebsockets context to the OpenSSL context
used by the client vhost. This allows SSL info callbacks to work
correctly for clients, like it currently does for servers.

Co-authored-by: Marty Flickinger <marty.flickinger@garmin.com>
Signed-off-by: Marty Flickinger <marty.flickinger@garmin.com>
Signed-off-by: Nate Karstens <nate.karstens@garmin.com>

lib/tls/openssl/openssl-client.c

@@ -924,6 +924,10 @@ lws_tls_client_create_vhost_context(struct lws_vhost *vh,
 		return 1;
 	}
 
+	SSL_CTX_set_ex_data(vh->tls.ssl_client_ctx,
+				openssl_SSL_CTX_private_data_index,
+				(char *)vh->context);
+
 	lws_plat_vhost_tls_client_ctx_init(vh);
 
 	tcr = lws_zalloc(sizeof(*tcr), "client ctx tcr");