contrib: Generate sources package if available
contrib: Generate sources package if available

Signed-off-by: Steven Koo <2be81fa51a694756e39f0ec857909538bdef4f38@ni.com>

EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus