gtk/: fully remove gtkalias hacks

https://bugzilla.gnome.org/show_bug.cgi?id=623845

gtk/gtktreemodel.c

@@ -28,7 +28,6 @@
 #include "gtktreeprivate.h"
 #include "gtkmarshalers.h"
 #include "gtkintl.h"
-#include "gtkalias.h"
 
 
 #define INITIALIZE_TREE_ITER(Iter) \
@@ -2190,6 +2189,3 @@ gtk_tree_row_reference_reordered (GObject     *proxy,
 
   gtk_tree_row_ref_reordered ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path, iter, new_order);
 }
-
-#define __GTK_TREE_MODEL_C__
-#include "gtkaliasdef.c"