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

[John Arbash Meinel]

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Alexander Belchenko wrote:
> bb:approve
> 
> This is definitely improvements: it works fine on all Windows 2K/Xp and
> Windows 98.
> 
> I have no Vista to test.
> 
> John, can you look and approve this patch, please?
> 
> 
> 

I added this NEWS entry, and I wanted to make sure it was correct:

* OS file locks are now taken out using ``CreateFile`` rather than
  ``LockFileEx`` on Windows. The locking remains exclusive with
  ``LockFileEx`` but now it also works on older versions of Windows
  (such as Win98). (Martin <gzlist>)

Does that fit what this patch is about?

John
=:->
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