[Merge] lp:~khurshid-alam/unity-settings-daemon/drop-gnomebg into lp:unity-settings-daemon

[Sebastien Bacher]

Build is failing

https://launchpadlibrarian.net/466568903/buildlog_ubuntu-focal-amd64.unity-settings-daemon_15.04.1+19.10.20190921-0ubuntu2_BUILDING.txt.gz

:-(
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https://code.launchpad.net/~khurshid-alam/unity-settings-daemon/drop-gnomebg/+merge/379825
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