Small STklos fixes

foreign/c.sld

@@ -33,7 +33,9 @@
     (racket (import (foreign c racket-primitives)))
     (sagittarius (import (foreign c sagittarius-primitives)))
     (stklos (import (foreign c stklos-primitives))
-            (export foreign-c:string-split))
+            (export foreign-c:string-split
+                    make-external-function
+                    free-bytes))
     (ypsilon (import (foreign c ypsilon-primitives))
              (export c-function
                      c-callback

foreign/c/stklos-primitives.sld

@@ -40,6 +40,7 @@
           ;c-bytevector-pointer-set!
           ;c-bytevector-pointer-ref
           void?
+          free-bytes
           )
   (include "c-bytevectors.scm")
   (include "stklos-primitives.scm"))