CLEANUP: task: move the task_per_thread definition to task.h

It's the second time I look for it and can't find it because it's not
in the right file.
diff --git a/include/proto/task.h b/include/proto/task.h
index badd130..859aea3 100644
--- a/include/proto/task.h
+++ b/include/proto/task.h
@@ -98,16 +98,6 @@
 extern int global_rqueue_size; /* Number of element sin the global runqueue */
 #endif
 
-/* force to split per-thread stuff into separate cache lines */
-struct task_per_thread {
-	struct eb_root timers;  /* tree constituting the per-thread wait queue */
-	struct eb_root rqueue;  /* tree constituting the per-thread run queue */
-	struct list task_list;  /* List of tasks to be run, mixing tasks and tasklets */
-	int task_list_size;     /* Number of tasks in the task_list */
-	int rqueue_size;        /* Number of elements in the per-thread run queue */
-	__attribute__((aligned(64))) char end[0];
-};
-
 extern struct task_per_thread task_per_thread[MAX_THREADS];
 
 __decl_hathreads(extern HA_SPINLOCK_T rq_lock);  /* spin lock related to run queue */
diff --git a/include/types/task.h b/include/types/task.h
index 508667c..ab909d0 100644
--- a/include/types/task.h
+++ b/include/types/task.h
@@ -57,6 +57,16 @@
 	__decl_hathreads(HA_SPINLOCK_T lock);
 };
 
+/* force to split per-thread stuff into separate cache lines */
+struct task_per_thread {
+	struct eb_root timers;  /* tree constituting the per-thread wait queue */
+	struct eb_root rqueue;  /* tree constituting the per-thread run queue */
+	struct list task_list;  /* List of tasks to be run, mixing tasks and tasklets */
+	int task_list_size;     /* Number of tasks in the task_list */
+	int rqueue_size;        /* Number of elements in the per-thread run queue */
+	__attribute__((aligned(64))) char end[0];
+};
+
 /* This part is common between struct task and struct tasklet so that tasks
  * can be used as-is as tasklets.
  */