[Merge] lp:~khurshid-alam/unity-settings-daemon/fix-airplane-switch into lp:unity-settings-daemon

[Sebastien Bacher]

Review: Approve

Indeed, from the build log 'warning: undefined reference to `gnome_settings_get_chassis_type' ... it's annoying that such problems don't fail the build :/

Thanks for the fix, it makes sense
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https://code.launchpad.net/~khurshid-alam/unity-settings-daemon/fix-airplane-switch/+merge/368880
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