Gian Piero Carrubba

This change allows, e.g.: (setf cl-scripting:\*failure-output* \*error-output*) or even wrapping a run-command invocation in a (with-output-to-string ...)

This is to avoid an 'undefined function' exception when using :cl-pdf without :cl-pdf-parser. The latter still works as it depends on the former.

This way I can use `(uiop:run-program '("...") :output t)` from inside a function invoked via `scriptl`