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e54c80b397
- simplify gathering header directories and compiler definitions recursively. - handle the case when the cmake directory object doesn't define header directories or compiler definitions. - honor more corners cases: - `INTERFACE_INCLUDE_DIRECTORIES` of the initial target. - handle no header directory for initial target. - de-duplicate header directories and compiler redefinitions to mimic CMake. - drop unnecessary `unset()`s. Note that the order of header directories remains different compared to how CMake passes them to the compiler when building tests. The order is already different in the test target `INCLUDE_DIRECTORIES` property, preventing to reproduce the exact CMake order. The distinction between `-I` and `-isystem` is also missing from target properties. Cherry-picked from #17768 Closes #17814