[fix] trivial-features pushes :darwin to cl:*features*

Author: digikar99

py4cl2-cffi.asd

@@ -31,7 +31,7 @@
                ;; Certain systems like Allegro CL 11 on M* Mac do not seem to
                ;; load config-darwin with the :darwin feature. We rely on
                ;; TRIVIAL-FEATURES to add the :macosx feature.
-               (:feature :macosx "py4cl2-cffi/config-darwin")
+               (:feature :darwin "py4cl2-cffi/config-darwin")
                "swank")
   :serial t
   :components ((:static-file "py4cl.py")