Idea: Failing the build unless you explicitely chose which Okular UI you want to build

[Oliver Sander]

> So cmake . would fail and tell you something like:
> 
>     Please specify -DOKULAR_UI=Desktop|Mobile|Both

I don't mind this flag at all, but I think the build should not fail without it.
That's just one more hurdle to pass for newcomers.

Best,
Oliver

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