qtubuntu-sensors FTBFS with Qt 5.7.1

[Timo Jyrinki]

As part of test building Qt reverse dependencies, it was found qtubuntu-sensors fails to build (at least) when built against Qt 5.7.1 on zesty.

As qtubuntu-sensors continues to work without a rebuild, it's not a blocker for Qt 5.7.1 transition but should be fixed for the next upload.

Log: https://launchpadlibrarian.net/301312422/buildlog_ubuntu-zesty-amd64.qtubuntu-sensors_0.6+16.10.20160524.1-0ubuntu2~~testrebuild1~~testrebuild1~571~571_BUILDING.txt.gz