gtk3 a11y: Just use ATK constants for roles

The ATK role used here that was added to ATK latest is
ATK_ROLE_FOOTNOTE, which was added in ATK 2.26.
With a minimum ATK version of ATK 2.28.1 (s.a.
Change-Id: Id7084366d2359deb60948b8969c1d3dcc68ddb47
"gtk3 a11y: Require atk >= 2.28.1, drop code for < 2.15.2"),
all constants can simply be used as is, so drop the special
handling that was there for older ATK versions which involved
calling 'atk_role_register' that was deprecated in ATK 2.12 [1]:

> Deprecated since:
> Since 2.12. If your application/toolkit doesn’t find a suitable
> role for a specific object defined at AtkRole, please submit a
> bug in order to add a new role to the specification.

[1] https://docs.gtk.org/atk/type_func.Role.register.html

Change-Id: I93579e84576feb1bcae8cecf2dc8b264e8be3153
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130329
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

0 files changed, 0 insertions, 0 deletions