[ci skip] Fix GH-17808 dependencies

Author: nielsdos

ext/phar/tests/gh17808.phpt

@@ -2,6 +2,7 @@
 GH-17808 (PharFileInfo refcount bug)
 --EXTENSIONS--
 phar
+zlib
 --FILE--
 <?php
 $fname = __DIR__.'/tar/files/Structures_Graph-1.0.3.tgz';