Log Message:
Update clutter to 1.2.8.

Clutter 1.2.8 (10/05/2010)
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  * List of changes since Clutter 1.2.6

    > Ignore unexpected GLX_BufferSwapComplete coming from Mesa (bug #2102)

    > Use the correct function for the GL_OES_framebuffer_object extension

    > Fix the chaining up of the GLX backend when dealing with redirected
      event handling (e.g. by Mutter) (bug #2101)

    > Do not attempt to use GL to convert formats under GLES (bug #2059)

    > Improve the robustness of the checks dealing with the maximum
      amount of layers in a CoglMaterial (bug #2064)

    > Fix cogl_read_pixels() on GLES (bug #2057)

    > Do not try to union sub paths (bug #2088)

    > Fix the clip stack (bug #2079)

    > Fix clutter_event_get_coords() for ENTER and LEAVE events.

    > Documentation fixes in the Cogl path API

    > Fix typos in the introspection annotations