clear zip stat cache after each ref leak run
diff --git a/Lib/test/test_pkgutil.py b/Lib/test/test_pkgutil.py
index f665e96..382474d 100644
--- a/Lib/test/test_pkgutil.py
+++ b/Lib/test/test_pkgutil.py
@@ -133,9 +133,7 @@
 
 def test_main():
     run_unittest(PkgutilTests, PkgutilPEP302Tests)
-    # this is necessary if test is run repeated (like when finding leaks)
-    import zipimport
-    zipimport._zip_directory_cache.clear()
+
 
 if __name__ == '__main__':
     test_main()