[gnome-builder] egg-priority-box: add missing TYPE macro

[Christian Hergert <chergert src gnome org>]

commit acc10cb7eff10ca1e12b2c7720ac3f838c6c1907
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jul 19 18:20:32 2016 -0700

    egg-priority-box: add missing TYPE macro

 contrib/egg/egg-priority-box.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/contrib/egg/egg-priority-box.h b/contrib/egg/egg-priority-box.h
index 36fa162..c90387b 100644
--- a/contrib/egg/egg-priority-box.h
+++ b/contrib/egg/egg-priority-box.h
@@ -23,6 +23,8 @@
 
 G_BEGIN_DECLS
 
+#define EGG_TYPE_PRIORITY_BOX (egg_priority_box_get_type())
+
 G_DECLARE_DERIVABLE_TYPE (EggPriorityBox, egg_priority_box, EGG, PRIORITY_BOX, GtkBox)
 
 struct _EggPriorityBoxClass