This makes the failing tests (test_unicodedata and, on OSX, test_hashlib) pass.

XXX However, I'm not sure that this is the right thing to do;
this behavior means that Unicode strings are automatically hashed as their
UTF-8 encoding.  Is that what we want?

but without it test_string passes.  I'm not sure why it was there.

Patch by Christian Heimes.

Once Barry and the email-sig have a working new version
we'll add it back.
If it doesn't make the 3.0a deadline (release August 31), too bad.