WineD3D: fix ARB_imaging abuse

[Roderick Colenbrander]

Hi,

When I was looking at porting WineD3D over to WGL I noticed that we are using the OpenGL 1.2 functions glBlendColor and glBlendEquation inside WineD3D. As the windows opengl32.dll is version 1.1, we need to move > 1.1 calls over to extensions. This patch will dynamicly load the glBlend* calls which are part of GL_ARB_imaging extension. The patch adds some defines and prototypes to wine_gl.h and patches the needed wined3d source files.

Regards,
Roderick Colenbrander
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