Honor $<LINK_ONLY> when checking interface properties
Callers of cmTarget::GetLinkImplementationClosure are interested in the set of targets whose interface properties propagate to the current target. This excludes targets guarded by $<LINK_ONLY>. Teach the CompatibleInterface test to cover suppression of interface compatibility tests with $<LINK_ONLY>. Although this is not recommended in practice, it is a way of covering the above behavior.
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