gtk/: fully remove gtkalias hacks

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

gtk/gtktextbuffer.c

@@ -40,7 +40,6 @@
 #include "gtktextiterprivate.h"
 #include "gtkprivate.h"
 #include "gtkintl.h"
-#include "gtkalias.h"
 
 
 #define GTK_TEXT_BUFFER_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE ((obj), GTK_TYPE_TEXT_BUFFER, GtkTextBufferPrivate))
@@ -4399,6 +4398,3 @@ _gtk_text_buffer_spew (GtkTextBuffer *buffer)
 {
   _gtk_text_btree_spew (get_btree (buffer));
 }
-
-#define __GTK_TEXT_BUFFER_C__
-#include "gtkaliasdef.c"