[issue18314] Have os.unlink remove junction points

[Kim Gräsman]

Kim Gräsman added the comment:

I really needed the well-wishing with regard to buffer sizing :-)

Here's a patch for a couple of fronts:
- Teach os.unlink about junction points
- Introduce _winapi.CreateJunction
- Introduce a new test suite in test_os.py for junction points

I pulled the definition of _REPARSE_DATA_BUFFER out into a new header called winreparse.h.

I'd appreciate critical review of _winapi.CreateJunction to make sure I haven't missed anything. I'm not familiar with the Python/C interop idioms, so I might have missed something wrt arguments/return values handling.

Happy new year!

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Added file: http://bugs.python.org/file33288/unlink-junctions.patch

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<http://bugs.python.org/issue18314>
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