contrib/lisp/org-contacts.el: Fix compiler warnings.

TINYCHANGE

contrib/lisp/org-contacts.el

@@ -42,6 +42,8 @@
 (eval-and-compile
   (require 'org))
 (require 'gnus-util)
+(require 'gnus-art)
+(require 'mai-utils)
 (require 'org-agenda)
 (require 'org-capture)