When running frozen (ie, a Windows exe) we override sys.std{out,err} so the
output can be diverted to a file.  There was a problem with logging.Logger
instances which would get a reference to the original objecs and then find
then closed after our second replacement.

The solution is to override them very early, and this MUST be done BEFORE
importing the log module.  Then, when the file property is set the StringIO
will be drained into the file.