script: Remove unused fields from grub_script_function struct

Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

include/grub/script_sh.h

@@ -359,13 +359,8 @@ struct grub_script_function
   /* The script function.  */
   struct grub_script *func;
 
-  /* The flags.  */
-  unsigned flags;
-
   /* The next element.  */
   struct grub_script_function *next;
-
-  int references;
 };
 typedef struct grub_script_function *grub_script_function_t;