Cleanup: Sync header+implementaiton definition.

Gave warning on Windows platform. There are more of these cases.

source/blender/blenkernel/BKE_mesh_mirror.h

@@ -46,7 +46,7 @@ void BKE_mesh_mirror_apply_mirror_on_axis(struct Main *bmain,
 struct Mesh *BKE_mesh_mirror_apply_mirror_on_axis_for_modifier(struct MirrorModifierData *mmd,
                                                                struct Object *ob,
                                                                const struct Mesh *mesh,
-                                                               int axis);
+                                                               const int axis);
 
 #ifdef __cplusplus
 }

source/blender/editors/include/ED_object.h

@@ -163,8 +163,8 @@ extern struct EnumPropertyItem prop_make_parent_types[];
 bool ED_object_parent_set(struct ReportList *reports,
                           const struct bContext *C,
                           struct Scene *scene,
-                          struct Object *ob,
-                          struct Object *par,
+                          struct Object *const ob,
+                          struct Object *const par,
                           int partype,
                           const bool xmirror,
                           const bool keep_transform,