Avoid using dash.el functions in macro bodies

* dash-functional.el (-cut): Prepare for this macro's inclusion in
dash.el by replacing any uses of dash.el functions that are not
defined at byte-compile-time with corresponding macros (#356).

dash-functional.el

@@ -87,8 +87,10 @@ Arguments denoted by <> will be left unspecialized.
 
 See SRFI-26 for detailed description."
   (let* ((i 0)
-         (args (mapcar (lambda (_) (setq i (1+ i)) (make-symbol (format "D%d" i)))
-                       (-filter (-partial 'eq '<>) params))))
+         (args (--keep (when (eq it '<>)
+                         (setq i (1+ i))
+                         (make-symbol (format "D%d" i)))
+                       params)))
     `(lambda ,args
        ,(let ((body (--map (if (eq it '<>) (pop args) it) params)))
           (if (eq (car params) '<>)