[pypy-dev] A test bug in Windows system

[bookaa]

My os is Win7, Trying pypy-pypy-2346207d9946

run:
    pypy>test_all.py translator\test\test_unsimplify.py

will get a error:
    WindowsError: [Error 5] : ....
it can not os.unlink(..) a file.

I find this is because 
    fd = os.open(tmpfile, os.O_WRONLY | os.O_CREAT, 0)
will create a readonly file in Windows system.

It should be
    fd = os.open(tmpfile, os.O_WRONLY | os.O_CREAT)

After fix this, still many test errors....

Bookaa
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