Add missing dependency on cmdline.
The removal of an artifical dependency in 'oh' on 'cmdline' has led to a few follow-up build errors:
https://atlas-tdaq-cdash.web.cern.ch/viewBuildError.php?buildid=10879
Origin: oh!2 (merged)
The removal of an artifical dependency in 'oh' on 'cmdline' has led to a few follow-up build errors:
https://atlas-tdaq-cdash.web.cern.ch/viewBuildError.php?buildid=10879
Origin: oh!2 (merged)