[Merge] ~acheron/kubuntu-packaging/+git/khelpcenter:kubuntu_unstable into ~kubuntu-packagers/kubuntu-packaging/+git/khelpcenter:kubuntu_unstable

[Philip Muškovac]

Review: Approve

I'll edit the changelog to list the build-depends that were added. Not something that's actually needed, but I like doing that when the list is short so the changelog already tells you all you need to know about the change.
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https://code.launchpad.net/~acheron/kubuntu-packaging/+git/khelpcenter/+merge/297155
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