CFFI-UFFI incompatibility: LOOKUP-FOREIGN-ENCODING function

Hi all, there seems to be a minor incompatibility between the latest UFFI and CFFI-UFFI-COMPAT: the LOOKUP-FOREIGN-ENCODING function is missing in the compat package. It is easy to fix by copy-pasting this function implementation from the UFFI i18n.lisp sources (see the attached patch). Could you please include it into the next CFFI release? Thanks, Victor