Only use CURLOPT_HTTP09_ALLOWED if libcurl is >= 7.66.0 (fixes meetecho#2307)

Author: lminiero

plugins/janus_streaming.c

@@ -6330,8 +6330,10 @@ static int janus_streaming_rtsp_connect_to_server(janus_streaming_mountpoint *mp
 	curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 5L);
 	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 0L);
 	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+#if CURL_AT_LEAST_VERSION(7, 66, 0)
 	curl_easy_setopt(curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_RTSP);
 	curl_easy_setopt(curl, CURLOPT_HTTP09_ALLOWED, 1L);
+#endif
 	/* Any authentication to take into account? */
 	if(source->rtsp_username && source->rtsp_password) {
 		/* Point out that digest authentication is only available is libcurl >= 7.45.0 */