[MERGE][0.15] Small updates for win32 support

[Alexander Belchenko]

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John Arbash Meinel пишет:
> The attached patch has 2 fixes for win32. Not all tests pass, but at
> least more of them pass than before.

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]

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