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If a build directory is accessible to other users it is possible to smuggle data in and out of build directories. Usually this is only a build purity problem, but in combination with other issues it can be used to break out of a build sandbox. to prevent this we default to using a subdirectory of nixStateDir (which is more restrictive). (cherry picked from pennae Lix commit 55b416f6897fb0d8a9315a530a9b7f0914458ded) (store setting done by roberth)