D3D/OGL: Add a TODO noting that we don't support GX_CULL_ALL, most notably required for accurate zfreeze emulation.

Source/Core/VideoBackends/D3D/Src/Render.cpp

@@ -1167,6 +1167,7 @@ void Renderer::SetGenerationMode()
 	};
 
 	// rastdc.FrontCounterClockwise must be false for this to work
+	// TODO: GX_CULL_ALL not supported, yet!
 	gx_state.rastdc.CullMode = d3dCullModes[bpmem.genMode.cullmode];
 }
 

Source/Core/VideoBackends/OGL/Src/Render.cpp

@@ -1673,6 +1673,7 @@ void Renderer::SetGenerationMode()
 	// none, ccw, cw, ccw
 	if (bpmem.genMode.cullmode > 0)
 	{
+		// TODO: GX_CULL_ALL not supported, yet!
 		glEnable(GL_CULL_FACE);
 		glFrontFace(bpmem.genMode.cullmode == 2 ? GL_CCW : GL_CW);
 	}