org-e-groff: Cleanup some useless defvars

* contrib/lisp/org-e-groff.el: Cleanup some useless defvars.

contrib/lisp/org-e-groff.el

@@ -38,12 +38,9 @@
 ;;; Code:
 
 (eval-when-compile (require 'cl))
-
-(defvar org-export-groff-default-packages-alist)
-(defvar org-export-groff-packages-alist)
-
 (require 'org-export)
 
+
 
 ;;; Define Back-End