Building 2.8 again after warning cleanup (696ed6d3ca)

source/blender/gpu/intern/gpu_draw.c

@@ -1687,7 +1687,7 @@ void GPU_end_dupli_object(void)
 }
 
 void GPU_begin_object_materials(
-        View3D *v3d, RegionView3D *rv3d, Scene *scene, SceneLayer *UNUSED(sl), Object *ob,
+        View3D *v3d, RegionView3D *rv3d, Scene *scene, SceneLayer *sl, Object *ob,
         bool glsl, bool *do_alpha_after)
 {
 	Material *ma;
@@ -1728,6 +1728,8 @@ void GPU_begin_object_materials(
 	if (rv3d->rflag & RV3D_IS_GAME_ENGINE) {
 		ob = BKE_object_lod_matob_get(ob, sl);
 	}
+#else
+	UNUSED_VARS(sl);
 #endif
 
 	/* initialize state */