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target_link_libraries: Allow use with targets in other directories

Brad King requested to merge brad.king/cmake:out-of-dir-linking into master

Previously the command did not allow naming targets on the LHS that were not created in the calling directory. Lift this restriction to enable more flexible use by projects.

Targets named on the RHS will need to be looked up during generation in the scope of the call site rather than the scope of the LHS target. Introduce an internal syntax in [INTERFACE_]LINK_LIBRARIES properties to specify target names that need to be looked up in a directory other than that containing the target on which the property is set. Add minimal documentation of the syntax to help users that encounter it.

Unfortunately CMake previously did allow such calls in the case that only INTERFACE libraries are specified, but those libraries would be looked up in the target's directory rather than the caller's. Add policy CMP0079 to enable the new behavior with new lookup scope in a compatible way.

Fixes: #17943 (closed)

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