Remove unneeded field in struct isoburn

src/isoburn.h

@@ -60,15 +60,6 @@ struct isoburn {
 
  /* The filesystem structure of the old image from media. */
  struct iso_volset *target_volset;
-
- /* The output options of the current run of libisofs.
-    Element .overwrite eventually points to a buffered new head
-    with size fields describing the new size alone, not the
-    new combined size counted from block 0. 
-    (This head is to be merged with above target_iso_head.) */
- struct ecma119_source_opts *new_wopts;
-
-
 };