When executable() or custom_target() has install: that is conditional as is false (i.e. not install:true), it won't be built by default. (build_by_default: defaults to install:). But if that program is added to public_programs, it will be build by default because it is pulled in by the test, effectively defeating the disablement. While at it, make 'ukify' follow the same pattern as 'kernel-install'. They will be used later together.
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