[3/3] ddraw: Emulate a 24 bit depth format without stencil or padding (try 2)

[Stefan Dösinger]

Changes:
* Don't introduce a new wined3d format, instead map both ddraw formats to 
X8D24

* Fix test failures on testbot(hopefully)

* Check the dwFlags member of the created surface. That's because other tests 
I'm working on show that the older interfaces don't set DDSD_PIXELFORMAT on Z 
buffers, but DDSD_ZBUFFERBITDEPTH is set. Nevertheless even older versions 
store proper data in ddpfPixelFormat.

* Fix a compile warning
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