- remove IShaderProgram and make the old classes an implementation detail of the OpenGL backend. In the long run they should be removed completely as their weird design is mostly an artifact of once having supported OpenGL 2

src/rendering/gl/system/gl_framebuffer.cpp

@@ -325,11 +325,6 @@ FModelRenderer *OpenGLFrameBuffer::CreateModelRenderer(int mli)
 	return new FGLModelRenderer(nullptr, gl_RenderState, mli);
 }
 
-IShaderProgram *OpenGLFrameBuffer::CreateShaderProgram() 
-{ 
-	return new FShaderProgram; 
-}
-
 IVertexBuffer *OpenGLFrameBuffer::CreateVertexBuffer()
 { 
 	return new GLVertexBuffer;