org-contacts: Require cl on compilation.

Signed-off-by: Michael Markert <markert.michael@googlemail.com>
Signed-off-by: Julien Danjou <julien@danjou.info>

contrib/lisp/org-contacts.el

@@ -36,6 +36,9 @@
 ;;
 ;;; Code:
 
+(eval-when-compile
+  (require 'cl))
+
 (eval-and-compile
   (require 'org))