create_message():  When os.link() doesn't exist, make a copy of the msg instead.  Allows this test to finish on Windows again.
create_message():  When os.link() doesn't exist, make a copy of the msg
instead.  Allows this test to finish on Windows again.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator