Fix skipif for non zlib builds re message http://lxr.php.net/opengrok/xref/PHP_TRUNK/ext/phar/phar_object.c#351

ext/phar/tests/bug53872.phpt

@@ -1,7 +1,10 @@
 --TEST--
 bug#53872 (internal corruption of phar)
 --SKIPIF--
-<?php if (!extension_loaded("phar")) die("skip"); ?>
+<?php 
+if (!extension_loaded("phar")) die("skip"); 
+if (!extension_loaded("zlib")) die("skip Test needs ext/zlib"); 
+?>
 --INI--
 phar.readonly=0
 --FILE--