[MERGE][0.15] Small updates for win32 support

[Aaron Bentley]

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John Arbash Meinel wrote:
> Alexander Belchenko wrote:
>> John Arbash Meinel ?8H5B:
>> Your patch introduce new fails during selftest like this:
> 
>> ERROR: #1106 test_revert.TestRevert.test_preserve_execute
>>     <WorkingTree4 of C:/Temp/jam/test0000.tmp/1K/01106/work/tree> is not locked
> 
>> And there is still some LockError exists.
>> Gzipped log attached.
> 
>> [µ]
> 
> 
> Well it seems a little weird to call WorkingTree.is_executable() when
> you don't have a lock on the tree.

Where do we stand with this work?  It looks as though this version of
the patch shouldn't be merged.  Is that right?

Aaron
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