(getenv, change-directory, run-program): Add support for CLISP.
(getenv, change-directory, run-program): Add support for CLISP.

swflint/McCLIM,onixie/mcclim,slyrus/mcclim,slyrus/mcclim,antifuchs/mcclim,swflint/McCLIM,antifuchs/mcclim,onixie/mcclim,onixie/mcclim,swflint/McCLIM