Jenkins build is back to normal : master-rtl-sdr » a1=default,a2=default,a3=default,osmocom-master-debian9 #56

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See 
<https://jenkins.osmocom.org/jenkins/job/master-rtl-sdr/a1=default,a2=default,a3=default,label=osmocom-master-debian9/56/display/redirect?page=changes>