More in Apple's docs (Application Kit Release Notes for OS X v10.9,
section "New Accessibility constants").

Change-Id: I92fb6d552e86997bfc789723f32626d908d11419
Reviewed-on: https://gerrit.libreoffice.org/5831Reviewed-by: Tor Lillqvist <tml@collabora.com>
Tested-by: Tor Lillqvist <tml@collabora.com>