Use IPv4 for master server connections

Your server's address is gathered from the request, so it needs to be IPv4!

src/hms123311.c

@@ -144,6 +144,7 @@ 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);
 
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, HMS_on_read);
 	curl_easy_setopt(curl, CURLOPT_WRITEDATA, buffer);