[MERGE][0.15] handle ERROR_DIRECTORY for win32 "bzr status filename"

[John Arbash Meinel]

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It seems Windows raises WindowsError(errno=267) when you do
"os.listdir('filename')" rather than errno.ENOTDIR.

Looking at pywin32, 267 == ERROR_DIRECTORY.

So the attached patch just defines that constant, and updates the code
to treat that error the same as the rest.

We are fortunate that WindowsError is a child of OSError. I'm also not
sure how Wouter's patch was working, since I can't find an e.winerror
member. Maybe it is a python2.5 versus 2.4 thing.

This and my last patch cover the errors I know about when working with
DirState trees on win32. We still need to fix the test suite, but I
haven't run into actual failures in day-to-day use.

John
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