- fixed model vertex buffer setup.

Setting the buffer and its attribute bindings must be one step, not twp. With Vulkan this is a single API call.
This removes the now obsolete SetVertexBuffer method from the model renderer's interface.

src/swrenderer/things/r_model.cpp

@@ -218,10 +218,6 @@ namespace swrenderer
 		return new SWModelVertexBuffer(needindex, singleframe);
 	}
 
-	void SWModelRenderer::SetVertexBuffer(IModelVertexBuffer *buffer)
-	{
-	}
-
 	void SWModelRenderer::ResetVertexBuffer()
 	{
 	}