Kind of a regression from commit 4d382636 ("qt5: Add basic
a11y support"), which made it public for a single call.

Change-Id: I631a861a98388223770cfca2704c3ddee6a0a8a0
Reviewed-on: https://gerrit.libreoffice.org/71836
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>