Tofu: fix ENABLE_TOFU switching

Change-Id: Ib33323d4b59ea8fb4f5f40dff7ea25a36773d5e2

executer/kernel/mcctrl/mcctrl.h

@@ -560,6 +560,7 @@ struct uti_futex_resp {
 	wait_queue_head_t wq;
 };
 
+#ifdef ENABLE_TOFU
 /*
  * Hash table to keep track of files and related processes
  * and file descriptors.
@@ -585,3 +586,4 @@ struct mcctrl_file_to_pidfd *mcctrl_file_to_pidfd_hash_lookup(
 int mcctrl_file_to_pidfd_hash_remove(struct file *filp,
 	ihk_os_t os, struct task_struct *group_leader, int fd);
 #endif
+#endif