* atk/Object.custom: take out a ref on the return value of
OnRefChild. Also add some null guarding and default to IntPtr.Zero
on exceptions.
svn path=/trunk/gtk-sharp/; revision=99826
* atk/Makefile.am: include Object.custom.
* atk/glue/object.c: glue to override class methods.
* atk/glue/Makefile.am: include object.c.
(Patch reviewed by mkestner)
svn path=/trunk/gtk-sharp/; revision=99178