Use orc instead of arc for gc flag

5 jobs for master
Status Job ID Name Coverage
  Test Source
failed #5486
test-source-lts

failed #5487
test-source-rolling

 
  Build
skipped #5490
build-rolling-amd64
skipped #5488
lintian-lts
skipped #5489
lintian-rolling
 
Name Stage Failure
failed
test-source-rolling Test Source There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log
failed
test-source-lts Test Source There has been a timeout failure or the job got stuck. Check your timeout limits or try again
No job log