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lisp-modules: don't override source registry
Previously, using withPackages for a lisp would totally ignore any of the default source registry entries, such as $XDG_DATA_HOME/common-lisp/source. To keep those around, an empty string must be added to CL_SOURCE_REGISTRY, as documented here: https://asdf.common-lisp.dev/asdf.html#Shell_002dfriendly-syntax-for-configuration