[gtkmm] SpinButton: Remove unnecessary _IMPLEMENTS_INTERFACE().

[Murray Cumming <murrayc src gnome org>]

commit 9f729fd224a44a3d59a105746d612eff84ceb8d5
Author: Murray Cumming <murrayc murrayc com>
Date:   Sat Aug 22 11:03:11 2015 +0200

    SpinButton: Remove unnecessary _IMPLEMENTS_INTERFACE().
    
    The base Entry already implements (and derives from) Editable.

 gtk/src/spinbutton.hg |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gtk/src/spinbutton.hg b/gtk/src/spinbutton.hg
index fce5848..852767f 100644
--- a/gtk/src/spinbutton.hg
+++ b/gtk/src/spinbutton.hg
@@ -45,7 +45,6 @@ class Adjustment;
 class SpinButton : public Entry
 {
   _CLASS_GTKOBJECT(SpinButton,GtkSpinButton,GTK_SPIN_BUTTON,Gtk::Entry,GtkEntry)
-  _IMPLEMENTS_INTERFACE(Editable)
 public:
 
   //TODO: This constructor should be implicit