rlib/test/test_rwin32.py::test_formaterror_unicode

def test_formaterror_unicode():
        msg, lgt = rwin32.FormatErrorW(34)
        assert type(msg) is str
>       assert '%2' in msg
E       assert '%2' in 'Tewogdset si h rv\xf3\x90\x80\xae\nnet% Vlm eilNme:%)it rv 1\xf2\xa0\x80\x8d\x00\xea\xbc\x9b\xe0\xa0\x80d\\yysufbido6\\lv\\pto-i-8-4bidryhnri\\etts_wn'

rlib\test\test_rwin32.py:101: AssertionError

builder: rpython-win-x86-64 build #399

test: rlib/test/test_rwin32/py/test_formaterror_unicode