[arch-general] Remove Clisp from repository

Hello, firstly, I don't know where I can send this message, so sorry if this is the wrong place. Clisp (an ANSI Common Lisp interpreter) hadn't received a new release since 2010-07-07 and the last update on the extra repo was on 2019-01-11, so I thought as we have others better options than Clisp, like sbcl on the extra repo, that has an active development, may be better if the Clisp package is removed from the arch repositories.