fix #4211: the __path__ of a frozen package should be a list.

Patch by Brett Cannon, review by Christian Heimes.
diff --git a/Lib/test/test_frozen.py b/Lib/test/test_frozen.py
index 545941b..ab7b52f 100644
--- a/Lib/test/test_frozen.py
+++ b/Lib/test/test_frozen.py
@@ -22,6 +22,7 @@
             self.assertEqual(len(dir(__phello__)), 7, dir(__phello__))
         else:
             self.assertEqual(len(dir(__phello__)), 8, dir(__phello__))
+        self.assertEquals(__phello__.__path__, [__phello__.__name__])
 
         try:
             import __phello__.spam