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As mentioned in RT#125850, the check for tklib's existence can fail even
As mentioned in RT#125850, the check for tklib's existence can fail even if the library has been installed. This change tests for the existence of the `cursor` tklib package which was part of the initial tklib import commit (https://core.tcl.tk/tklib/info/ec23b04ac240ca3c) and still exists in the library, hence this check should now be fairly robust and backwards compatible over (hopefully) all versions of tklib.