WineD3D: Don't create a pbo for system memory surfaces

[Roderick Colenbrander]

Hi,

The WineD3D function UpdateSurface method wasn't aware of PBOs yet which 
caused a regression (bug 9666). The source surface we were passing to it had 
a pbo attached to it. In case of a PBO allocatedMemory is only available when 
the memory is locked which isn't the case when UpdateSurface is called.

The behavior that matches D3D the most is to not create a pbo for system 
memory surfaces. So that is what this patch does. Note that this patch might 
depend on Stefan his two PBO patches. (Those patches are good)

Regards,
Roderick Colenbrander
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