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During a recent change, the build system accidentally dropped the (theoretical) support for the CLC builtins library to build target-specific builtins from the 'amdgpu' directory, due to a change in variable names. This functionality wasn't being used but was spotted during another code review. This commit takes the opportunity to clean up and better document the code that manages the list of directories to search for builtin implementations. While fixing this, some references to now-removed SOURCES files were discovered which have been cleaned up.