Export: Disallow exported interface includes in src/build tree (#14592).
Allow directories in the source tree or build tree only if the install tree is a subdirectory of the source tree or build tree, as appropriate. Re-use the test files in the RunCMake.include_directories test to run in multiple scenarios. Bump the required CMake version in the test to 3.0 to ensure that the new policy warnings are emitted correctly.
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