Fix test on Windows: catch PermissionError

Author: vstinner

Lib/test/test_importlib/test_util.py

@@ -799,8 +799,9 @@ def test_package(self):
             with open(filename, "w", encoding="utf8") as fp:
                 print("attr = 'load_source_path_pkg'", file=fp)
 
-            # Package cannot be imported from a directory
-            with self.assertRaises(IsADirectoryError):
+            # Package cannot be imported from a directory. It can with
+            # IsADirectoryError on Unix and PermissionError on Windows.
+            with self.assertRaises(OSError):
                 importlib.util.load_source_path(modname, dirname)
 
             # Loading a package __init__.py file is ok