[1/5] wined3d: Make the glram parameter of WineD3DAdapterChangeGLRam signed

[Stefan Dösinger]

This is another set of msvc warning fixes. The patches should be mostly 
independent of each other.

msvc generates a warning when using a unary minus with an unsigned value. I 
don't know what the best way to handle this is. Ignore it? Subtract the value 
from zero?(what I've done here)? Cast to signed?
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