gtk/: fully remove gtkalias hacks

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

gtk/gtkiconfactory.c

@@ -38,7 +38,6 @@
 #include "gtkintl.h"
 #include "gtkbuildable.h"
 #include "gtkbuilderprivate.h"
-#include "gtkalias.h"
 
 
 static GSList *all_icon_factories = NULL;
@@ -3003,6 +3002,3 @@ gtk_icon_source_get_filename (const GtkIconSource *source)
 }
 
 #endif
-
-#define __GTK_ICON_FACTORY_C__
-#include "gtkaliasdef.c"