Add missing SKIPIF clause for require_hash.phpt

Author: cmb69

ext/phar/tests/zip/require_hash.phpt

@@ -1,7 +1,10 @@
 --TEST--
 Phar: zip-based phar, require_hash=1, no signature
 --SKIPIF--
-<?php if (!extension_loaded('phar')) die('skip'); ?>
+<?php
+if (!extension_loaded('phar')) die('skip');
+if (!extension_loaded('zip')) die('skip');
+?>
 --INI--
 phar.readonly=1
 phar.require_hash=0