InnoDB: Make btr_cur_unmark_extern_fields() a static function

innobase/btr/btr0cur.c:
  Make btr_cur_unmark_extern_fields() a static function
innobase/include/btr0cur.h:
  Remove btr_cur_unmark_extern_fields()

innobase/btr/btr0cur.c

@@ -65,6 +65,16 @@ this many index pages */
 /*--------------------------------------*/
 #define BTR_BLOB_HDR_SIZE		8
 
+/***********************************************************************
+Marks all extern fields in a record as owned by the record. This function
+should be called if the delete mark of a record is removed: a not delete
+marked record always owns all its extern fields. */
+static
+void
+btr_cur_unmark_extern_fields(
+/*=========================*/
+	rec_t*	rec,	/* in: record in a clustered index */
+	mtr_t*	mtr);	/* in: mtr */
 /***********************************************************************
 Adds path information to the cursor for the current page, for which
 the binary search has been performed. */
@@ -2922,7 +2932,7 @@ btr_cur_mark_dtuple_inherited_extern(
 Marks all extern fields in a record as owned by the record. This function
 should be called if the delete mark of a record is removed: a not delete
 marked record always owns all its extern fields. */
-
+static
 void
 btr_cur_unmark_extern_fields(
 /*=========================*/

innobase/include/btr0cur.h

@@ -435,16 +435,6 @@ btr_cur_mark_dtuple_inherited_extern(
 	ulint		n_ext_vec,	/* in: number of elements in ext_vec */
 	upd_t*		update);	/* in: update vector */
 /***********************************************************************
-Marks all extern fields in a record as owned by the record. This function
-should be called if the delete mark of a record is removed: a not delete
-marked record always owns all its extern fields. */
-
-void
-btr_cur_unmark_extern_fields(
-/*=========================*/
-	rec_t*	rec,	/* in: record in a clustered index */
-	mtr_t*	mtr);	/* in: mtr */
-/***********************************************************************
 Marks all extern fields in a dtuple as owned by the record. */
 
 void