Have GdkWindowImplQuartz implement GdkPaintable.

Have GdkWindowImplQuartz implement GdkPaintable.

2006-04-11  Anders Carlsson  <andersca@mac.imendio.com>

        * gdk/quartz/GdkQuartzView.c:
        (-[GdkQuartzView drawRect:]):
        * gdk/quartz/gdkdrawable-quartz.c:
        (gdk_quartz_ref_cairo_surface):
        (_gdk_quartz_drawable_get_context):
        (_gdk_quartz_drawable_release_context):
        * gdk/quartz/gdkwindow-quartz.c:
        (gdk_window_impl_quartz_finalize):
        (gdk_window_impl_quartz_class_init):
        (gdk_window_impl_quartz_begin_paint_region):
        (gdk_window_impl_quartz_end_paint):
        (gdk_window_impl_quartz_invalidate_maybe_recurse):
        (gdk_window_impl_quartz_process_updates):
        (gdk_window_impl_quartz_paintable_init):
        (_gdk_window_impl_quartz_get_type):
        * gdk/quartz/gdkwindow-quartz.h:
        Have GdkWindowImplQuartz implement GdkPaintable.