MDEV-31118: Override lintian dh-addon for systemd

Lintian erros with
 missing-build-dependency-for-dh-addon systemd (*)

One of these premises should be installed:
 debhelper:any (>= 9.20160709~)
 debhelper-compat:any
 dh-sequence-systemd:any
 dh-systemd:any

As there is package debhelper version 10 or higher required
for build. This is false positive Lintian error which should
be supressed..

NOTE TO MERGER: This is only up-to MariaDB 10.10.

debian/source/lintian-overrides

+# MariaDB use high enough debhelper so this is should
+# be considered as bug in lintia
+missing-build-dependency-for-dh-addon systemd (*)
 # Necessary for drop-in-place-replacement upgrades on mysql-server/-client
 # since package breaks/replaces these but at the same time also provides them
 version-substvar-for-external-package mariadb-client-core -> mysql-client-5.5