Fix the last two tests.

Thanks to Brett for fixing so many before!
I see some tracebacks from threads when testing test_bsddbd3 (on OSX)
but the test claims to pass, so I'm ignoring these.

Lib/test/test_compile.py

@@ -53,8 +53,8 @@ class TestSpecifics(unittest.TestCase):
                 raise KeyError
             def __setitem__(self, key, value):
                 self.results = (key, value)
-            def __iter__(self):
-                return iter('xyz')
+            def keys(self):
+                return list('xyz')
 
         m = M()
         g = globals()