wendelin.core: v↑ +py3 build fix

Pick up wendelin.core@3d0f134c to
fix build on Python3.
12 jobs for arnau-aurel-zope4 in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:14:34

passed SlapOS.Eggs.UnitTest-Master.Python3

00:12:40

passed SlapOS.SlapRunner.ResilienceTest-Master

00:21:55

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

01:32:05

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

23:34:47

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

08:49:40

passed SlapOS.Eggs.UnitTest-Master.Python2

00:12:48

passed SlapOS.Eggs.UnitTest-Master.Python3

00:12:37

passed SlapOS.Eggs.UnitTest-Master.Python3

00:12:44

passed SlapOS.SlapRunner.ResilienceTest-Master

00:23:57

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

01:28:21

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

09:00:00