ob-J: Do not use cl or cl-lib functions at runtime

* lisp/ob-J.el: Do not use `second', `third', `fourth', `minusp' and
  `plusp'.

lisp/ob-J.el

@@ -65,11 +65,11 @@ PARAMS are given by org-babel.
 This function is called by `org-babel-execute-src-block'"
   (message "executing J source code block")
   (let* ((processed-params (org-babel-process-params params))
-	 (sessionp (cdr (assoc :session params)))
+	 (sessionp (nth 1 (assoc :session params)))
          (session (org-babel-j-initiate-session sessionp))
-         (vars (second processed-params))
-         (result-params (third processed-params))
-         (result-type (fourth processed-params))
+         (vars (nth 2 processed-params))
+         (result-params (nth 3 processed-params))
+         (result-type (nth 4 processed-params))
          (full-body (org-babel-expand-body:J
                      body params processed-params))
 	 (tmp-script-file (org-babel-temp-file "J-src")))
@@ -141,10 +141,10 @@ Don't trust first line."
 	 (a (obj-get-string-alignment x))
 	 (lines (split-string x "\n" t))
 	 b)
-    (cond ((minusp a)
+    (cond ((< a 0)
 	   (setq b (obj-match-second-space-right (nth 0 lines)))
 	   (concat (make-string (+ a b) ? ) x))
-	  ((plusp a)
+	  ((> a 0)
 	   (setq b (obj-match-second-space-left (nth 0 lines)))
 	   (concat (make-string (- a b) ? ) x))
 	  (t x))))