removed old cl-async-future compat hack

src/green-threads.lisp

@@ -242,15 +242,6 @@
 
 ;; Futures
 
-;; TODO: remove once cl-async-future gets version bump to 0.4.2 in Quicklisp
-(eval-when (:load-toplevel :compile-toplevel)
-  (unless (asdf:version-satisfies (asdf:find-system :cl-async-future) "0.4.2")
-    (defun lookup-forwarded-future (future)
-      (cl-async-future::lookup-actual-future future))
-
-    (defun future-finished-p (future)
-      (cl-async-future::future-finished future))))
-
 (defun queue-future (future action &optional thread)
   "Queues an action on current (or specified) thread to take place when
    provided future is completed."