Tweak Mixbus pingback, follow http -> https redirects

gtk2_ardour/pingback.cc

@@ -59,6 +59,13 @@ _pingback (void *arg)
 	pthread_set_name ("Pingback");
 	ArdourCurl::HttpGet h;
 
+#ifdef MIXBUS
+	curl_easy_setopt (h.curl (), CURLOPT_FOLLOWLOCATION, 1);
+	/* do not check cert */
+	curl_easy_setopt (h.curl (), CURLOPT_SSL_VERIFYPEER, 0);
+	curl_easy_setopt (h.curl (), CURLOPT_SSL_VERIFYHOST, 0);
+#endif
+
 	ping_call* cm = static_cast<ping_call*> (arg);
 	string return_str;
 	//initialize curl