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Follow up commit 07611869 (project: Add variable CMAKE_PROJECT_INCLUDE_BEFORE, 2019-03-28, v3.15.0-rc1~294^2) with a project-specific variant. This variable will be used similar to the already existing `CMAKE_PROJECT_INCLUDE_BEFORE` and `CMAKE_PROJECT_<PROJECT-NAME>_INCLUDE` variables. Fixes: #19854
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