fix expect for win

Author: mvorisek

ext/phar/tests/bug69958.phpt

@@ -10,8 +10,8 @@ $tarphar = new PharData(__DIR__.'/bug69958.tar');
 $phar = $tarphar->convertToData(Phar::TAR);
 ?>
 --EXPECTF--
-Fatal error: Uncaught BadMethodCallException: phar "%s/bug69958.tar" exists and must be unlinked prior to conversion in %s/bug69958.php:%d
+Fatal error: Uncaught BadMethodCallException: phar "%sbug69958.tar" exists and must be unlinked prior to conversion in %sbug69958.php:%d
 Stack trace:
-#0 %s/bug69958.php(%d): PharData->convertToData(%d)
+#0 %sbug69958.php(%d): PharData->convertToData(%d)
 #1 {main}
-  thrown in %s/bug69958.php on line %d
+  thrown in %sbug69958.php on line %d