Only restrict master server connection to IPv4 if -noipv6

src/http-mserv.c

@@ -196,7 +196,9 @@ HMS_connect (const char *format, ...)
 
 	curl_easy_setopt(curl, CURLOPT_URL, url);
 	curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
-	curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
+
+	if (M_CheckParm("-noipv6"))
+		curl_easy_setopt(curl, CURLOPT_IPRESOLVE, CURL_IPRESOLVE_V4);
 
 	curl_easy_setopt(curl, CURLOPT_TIMEOUT, cv_masterserver_timeout.value);
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, HMS_on_read);