[gtkmm] ExpanderStyle is deprecated and not used.

[Murray Cumming <murrayc src gnome org>]

commit dcd56c65646925880aabb9b796913f56990b46ec
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Jun 6 17:41:52 2014 +0200

    ExpanderStyle is deprecated and not used.

 gtk/src/enums.hg |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gtk/src/enums.hg b/gtk/src/enums.hg
index 71239e0..3468a12 100644
--- a/gtk/src/enums.hg
+++ b/gtk/src/enums.hg
@@ -38,7 +38,13 @@ _WRAP_ENUM(AttachOptions, GtkAttachOptions)
 _WRAP_ENUM(ButtonBoxStyle, GtkButtonBoxStyle)
 _WRAP_ENUM(DeleteType, GtkDeleteType)
 _WRAP_ENUM(DirectionType, GtkDirectionType)
+
+//TODO: let _WRAP_ENUM() take a deprecated option.
+/**
+ * @deprecated This is not used in the gtkmm API.
+ */
 _WRAP_ENUM(ExpanderStyle, GtkExpanderStyle)
+
 _WRAP_ENUM(BuiltinIconSize, GtkIconSize)
 _WRAP_ENUM(TextDirection, GtkTextDirection)
 _WRAP_ENUM(Justification, GtkJustification)