silence mkdir to fix fails after unclean test run

Author: weltling

ext/standard/tests/file/bug65701.phpt

@@ -6,7 +6,7 @@ Boro Sitnikovski <buritomath@yahoo.com>
 <?php
 $file_path = dirname(__FILE__) . "/bug65701/";
 
-mkdir($file_path);
+@mkdir($file_path);
 
 $src = $file_path . '/srcbug65701_file.txt';
 $dst = tempnam($file_path, 'dstbug65701_file.txt');