Switch regrtest to use StringIO instead of cStringIO for test_multiprocessing on Windows. Issue 8333.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 75716dc..50519bf 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -147,7 +147,7 @@
 option '-uall,-bsddb'.
 """
 
-import cStringIO
+import StringIO
 import getopt
 import json
 import os
@@ -838,7 +838,7 @@
     if verbose:
         capture_stdout = None
     else:
-        capture_stdout = cStringIO.StringIO()
+        capture_stdout = StringIO.StringIO()
 
     test_time = 0.0
     refleak = False  # True if the test leaked references.