Avoid infinite recursion on unsupported Lisps #3
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When a Lisp isn't in the supported list, the system file still tries to add a method to ASDF:PERFORM. The (find-system :utils-kt) in the lambda list then recursively calls find-system, fails to find the undefined utils-kt, and loads utils-kt.asd again, invoking defmethod again, ad infinitum (or until it blows the stack).
This change signals an error on unsupported Lisps instead.