Remove left over org-export-blocks requires

lisp/ob-ditaa.el

@@ -34,9 +34,6 @@
 ;; 3) we are adding the "file" and "cmdline" header arguments
 ;;
 ;; 4) there are no variables (at least for now)
-;;
-;; 5) it depends on a variable defined in org-exp-blocks (namely
-;;    `org-ditaa-jar-path') so be sure you have org-exp-blocks loaded
 
 ;;; Code:
 (require 'ob)

lisp/org-exp.el

@@ -29,7 +29,6 @@
 (require 'org)
 (require 'org-macs)
 (require 'org-agenda)
-(require 'org-exp-blocks)
 (require 'ob-exp)
 (require 'org-src)