[MERGE] Implement bzrlib.lock with CreateFile rather than LockFileEx on win32 (operational part)

[Martin (gzlist)]

2009/6/19 Alexander Belchenko <bialix at ukr.net>:
>
> Do you run existing per_lock tests? There is a lot of test failures.

I did, naturally they passed on both the boxes I tried.

Problem is on your machine, this raises:

>>> import ctypes
>>> assert ctypes.WinError(5).errno == 5

Annoyingly, I'd read about just this problem as described in the
bzrlib.osutils._is_error_enotdir docstring, but promptly forgot about
it.

Attached amended bundle with trivial fix.

Martin
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