skip test maybe

Author: ndossche

ext/pdo_firebird/tests/bug_76448.phpt

@@ -6,6 +6,8 @@ sockets
 --XLEAK--
 A bug in firebird causes a memory leak when calling `isc_attach_database()`.
 See https://github.com/FirebirdSQL/firebird/issues/7849
+--SKIPIF--
+<?php if (PHP_INT_SIZE != 8) die("skip: 64-bit only"); ?>
 --FILE--
 <?php
 require_once "payload_server.inc";