[gtkmm] Tell the docs generator about GdkRGBA

[Murray Cumming <murrayc src gnome org>]

commit ae5d97883847b9470fb056e0adf57f05582e46df
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Jul 26 10:56:28 2013 +0200

    Tell the docs generator about GdkRGBA

 gdk/src/gdk_extra_objects.defs |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/gdk/src/gdk_extra_objects.defs b/gdk/src/gdk_extra_objects.defs
index 5cea70d..02acddf 100644
--- a/gdk/src/gdk_extra_objects.defs
+++ b/gdk/src/gdk_extra_objects.defs
@@ -66,6 +66,12 @@
   (gtype-id "GDK_TYPE_REGION")
 )
 
+(define-object RGBA
+  (in-module "Gdk")
+  (c-name "GdkRGBA")
+  (gtype-id "GDK_TYPE_RGBA")
+)
+
 (define-object Screen
   (in-module "Gdk")
   (c-name "GdkScreen")