Log Message:
Update lablgtk to 1.2.6:
  * fixed a problem of SpinButton.get_value_as_int for the case of
    the value is minus' src/gtkEdit.ml (Jun Furuse)
  * ocamllex is abstracted by CAMLLEX in Makefiles (Jun Furuse)
  * more parametrizations in config.make.nt (Jun)
  * added the selection method to clist. (Jun)
  * Glib.Io.add_watch returns event source, so that we can remove it later (J)
  * added Glib.Io.read (J)
  * added a new module Gdk.Input (J)
  * various improvements to GtkText (Antoine Mine)
  * fix Glib.IO (Henri Dubois-Ferriere)
  * fixes in ml_gdk.c: win32 and ClientData
  * GtkThread.main switches GtkMain.Main.main to call GtkThread.thread_main
  * added GList.clist#get_row_state and GWindow.file_selection#file_list
    (by Francois Pessaux)
  * added META (by Stefano Zacchiroli)
  * fixed applications/camlirc (Tim Freeman)
  * add gdk_property_*
  * fix GdkPixbuf.create_pixmap
  * add GdkEventClient (requested by Didier le Botlan)
  * add Gdk.Window.get_pointer_location (Tim Freeman)