Update clutter to 1.4.0.

Release Notes for Clutter 1.4
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* ClutterLayoutManager sub-classes overriding the set_container() virtual
  function should chain up to the parent class's implementation.

* The ClutterTexture:filename property is now readable, as well as writable;
  this allows querying the Texture for the filename storing the image data.
  The value will be unset when using the set_from_*_data() family of
  functions.

* If both the :sync-size and the :keep-aspect-ratio properties of a
  ClutterTexture are set to TRUE, then the texture actor will update its
  ClutterActor:request-mode property depending on the orientation of the
  image data - height-for-width for landscape, and width-for-height for
  portrait. Square image data will default to height-for-width, like all
  actors. You can still explicitly override the :request-mode value, or
  you can unset the :sync-size property to control the size yourself.

* All the key symbol macros have been renamed from CLUTTER_* to
  CLUTTER_KEY_*. The old names are still available inside the
  clutter-keysyms-compat.h header, which is included by clutter-keysyms.h
  unless CLUTTER_DISABLE_DEPRECATED is defined.

(obache)