[release][21.2.21]

Dear Community, we are happy to announce a new release of ECL. https://common-lisp.net/project/ecl/posts/ECL-2121-release.html Best regards, Daniel -- Daniel Kochmański ;; aka jackdaniel | Przemyśl, Poland TurtleWare - Daniel Kochmański      | www.turtleware.eu "Be the change that you wish to see in the world." - Mahatma Gandhi