Update from debian/buster-security for apertis/v2021-security
Merge updates from Debian buster-security.
Also, in Apertis the build source stage performs a strict check of dependencies using dpkg-checkbuilddeps which fails due to the lack of libevent-dev.
Fix the issue by make the dependency explicit.
https://phabricator.apertis.org/T5378
Signed-off-by: Walter Lozano walter.lozano@collabora.com