fixup! mariadb: build without tests to save space

Commit de5e381d broke build of
MariaDB >= 10.5. There were warnings about that with 10.4.
23 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:14:29

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:39:41

failed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:02:59

passed ERP5.UnitTest-Zope4Py3-Py2

06:44:42

failed SlapOS.Eggs.UnitTest-Master.Python2

00:14:06

failed SlapOS.Eggs.UnitTest-Master.Python3

00:17:32

failed SlapOS.SoftwareReleases.IntegrationTest-Master

15:22:00

passed SlapOS.Theia.ResilienceTest-Master-ERP5

10:18:06

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:39:11

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

09:00:40

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:40:43

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:48:45

failed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

15:03:06

failed SlapOS.Eggs.UnitTest-Master.Python2

00:15:01

failed SlapOS.Eggs.UnitTest-Master.Python2

00:14:10

failed SlapOS.Eggs.UnitTest-Master.Python2

00:25:42

failed SlapOS.Eggs.UnitTest-Master.Python3

00:30:21

failed SlapOS.Eggs.UnitTest-Master.Python3

00:14:01

failed SlapOS.Eggs.UnitTest-Master.Python3

00:19:07

failed SlapOS.Eggs.UnitTest-Master.Python3

00:14:37

failed SlapOS.Eggs.UnitTest-Master.Python3

00:14:09

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:50:13

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:59:53