This reverts commit 1c4a859c8d,
where the override modifiers were removed owing to the noisy
"inconsistent override modifiers" which is default-on in clang.
This warning was disabled in 77577f717f,
so we can reinstate the overrides.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>