[gimp] libgimpwidgets: add gimp_chain_button_{get, size}_icon_size() to gimpwidgets.def

[Ell <ell src gnome org>]

commit 07145108020948b53b0a58759d0bfd966552fc03
Author: Ell <ell_se yahoo com>
Date:   Tue Feb 5 03:47:49 2019 -0500

    libgimpwidgets: add gimp_chain_button_{get,size}_icon_size() to gimpwidgets.def

 libgimpwidgets/gimpwidgets.def | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/libgimpwidgets/gimpwidgets.def b/libgimpwidgets/gimpwidgets.def
index 2ba7be7d17..00f97a0dbc 100644
--- a/libgimpwidgets/gimpwidgets.def
+++ b/libgimpwidgets/gimpwidgets.def
@@ -24,9 +24,11 @@ EXPORTS
        gimp_cell_renderer_toggle_new
        gimp_chain_button_get_active
        gimp_chain_button_get_button
+       gimp_chain_button_get_icon_size
        gimp_chain_button_get_type
        gimp_chain_button_new
        gimp_chain_button_set_active
+       gimp_chain_button_set_icon_size
        gimp_chain_position_get_type
        gimp_color_area_get_color
        gimp_color_area_get_type