Fix cl -> cl-lib deprecation warnings.
Fix cl -> cl-lib deprecation warnings.

‘cl-lib’ was introduced in Emacs version 24 as a replacement for
the older ‘cl’ library.

Emacs version 27 deprecated ’cl’ in favor of ‘cl-lib’.

Preface the ‘cl’ library functions with the "cl-" prefix used by the
new library.

sharplispers/log4cl,sharplispers/log4cl