cmTarget: Fix diagnostic of target_link_libraries in wrong directory (#15626)
Since commit v3.3.0-rc1~62^2~5 (cmTarget: Store only cmListFileContext for CMP0023 handling, 2015-05-18) a call to target_link_libraries on a target that was defined in another (non-ancestor) directory crashes because no execution context is left active. Fix this by getting the execution context from the actual cmMakefile where the current target_link_libraries call takes place. Test this by verifying that such calls correctly produce an error diagnostic instead of crashing.
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