drop now-unused list

src/core/sched_ctx.h

@@ -63,8 +63,6 @@ struct starpu_sched_ctx {
 
 struct starpu_machine_config_s;
 
-struct callback_list callback_lists[STARPU_NMAXWORKERS];
-
 /* init sched_ctx_id of all contextes*/
 void _starpu_init_all_sched_ctx(struct starpu_machine_config_s *config);