[MERGE][1.6] Win32 regression fix for ENOTDIR handling

[John Arbash Meinel]

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This patch follows up on Mark Hammond's recommended patch for 1.6.
Basically, it adds a helper function for handling all the ways that
ENOTDIR gets raised on win32, as a workaround for os.listdir().

Python does a decent job of abstracting the OS when things work, it does
a rather poor job when things fail.

Ultimately I would like to unify this with the code in WorkingTree4
which also includes checks for ENOENT, but for now, I think this is
sufficient.

I am planning on getting this into 1.6, but I would like another
reviewer to approve it if possible.

I *can* say that doing "bzr rm file" fails without this patch, and
succeeds with it, so that part at least is correct.

John
=:->
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