[2/6] ddraw: Introduce a function to convert a DDSURFACEDESC to a DDSURFACEDESC2 (try 2)

[Stefan Dösinger]

Changes from try 1:
* Copy ddsCaps even if DDSD_CAPS is not set
* pass the unmodified DDSURFACEDESC structure to dump_surface_desc

Since the output of this function is read only by our code we don't need the 
memset. Unfortunately CreateSurface still has problems with that. It doesn't 
read any members that don't have their flag set(Except those convered by 
tests, like ddsCaps), but it copies some values into the surface's 
DDSURFACEDESC2, from where it can be passed back to the app via 
GetSurfaceDesc() or Lock(), which may read the values without checking for the 
DDSD_* flag. Note that this bug exists regardless of this patch in 
IDirectDraw4/IDirectDraw7.

This patch makes it easier to clean up CreateSurface because the size checks 
can be removed. The plan is to fix CreateSurface and after that change the 
memset value to something like 0xff for catching remaining issues or remove 
it.
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