fix test

Author: devnexen

ext/ftp/tests/gh20601.phpt

@@ -2,6 +2,10 @@
 GH-20601 (ftp_connect timeout overflow)
 --EXTENSIONS--
 ftp
+--SKIPIF--
+<?php
+if (PHP_INT_SIZE != 8) die("skip: 64-bit only");
+?>
 --FILE--
 <?php
 try {