ob-ditaa: needs to require org-compat for org-find-library-dir

* lisp/ob-ditaa.el: Needs to (require 'org-compat) for org-find-library-dir.

lisp/ob-ditaa.el

@@ -40,6 +40,7 @@
 
 ;;; Code:
 (require 'ob)
+(require 'org-compat)
 
 (defvar org-ditaa-jar-path) ;; provided by org-exp-blocks