componant/slapos/obs.cfg: update OBS build

new cmmi recipe prevent from having twice the same environment variable.
Also correctly setup swig libraries and fix gobject-introspection compilation.
4 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

00:15:00

passed SlapOS.Eggs.UnitTest-Master.Python3

00:10:45

passed SlapOS.SlapRunner.ResilienceTest-Master

00:21:53

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:30:43