Log Message:
Update clutter to 1.2.12.

Clutter 1.2.12 (14/07/2010)
===============================================================================

  * List of changes since Clutter 1.2.10

    > Provide a fallback for MESA_copy_sub_buffer by using the
      EXT_blit_framebuffer extension. (BCP#2128)

    > Never promote clipped redraws to fullscreen redraws. (BCP#2136)

    > Fix rounding error in ClutterText. (BCP#2170)

    > Fix drawing of transparent stages on X11. (BCP#2050)

    > ClutterAnimator bug fixes.

    > ClutterAnimation fixes for vector-based API. (BCP#2149)

    > Fixes for the Windows backend event handling. (BCP#2135)

    > Fixes for the setup of the GL context on OSX. (BCP#1394)

    > Documentation improvements. (BCP#2081, BCP#2133)

    > Build fixes for the conformance test suite. (BCP#1930)