Log Message:
Update rcairo to 1.12.9.

Release 1.12.9 (2014-04-05) Kouhei Sutou <kou@cozmixng.org>
===========================================================

Improvements
------------

  * Supported cocoa gem. [Patch by Patrick Hanevold]
  * Made Cairo::Rectangle based on cairo_rectangle_int_t. It improves
    Ruby/GDK3 integration.
  * windows: Dropped binary packages support for Ruby 1.9.3.

Fixes
-----

  * Fixed a bug that Cairo::Context isn't GC-ed without explicit
    Cairo::Context#destroy.
    [ruby-gnome2-devel-en][Reported by Detlef Reichl]

Thanks
------

  * Patrick Hanevold
  * Detlef Reichl