test__locale (two underscores) can't pass on Windows: RADIXCHAR doesn't

exist, and neither do any of the specific 5-letter locale names the test
is looking for.

Lib/test/regrtest.py

@@ -554,6 +554,7 @@ def printlist(x, width=70, indent=4):
 _expectations = {
     'win32':
         """
+        test__locale
         test_al
         test_bsddb185
         test_bsddb3