New API call isoburn_igopt_set_hfsp_serial_number()

libisoburn/isoburn.h

@@ -672,6 +672,12 @@ struct isoburn_imgen_opts {
     /* Eventual name of the non-ISO aspect of the image. E.g. SUN ASCII label.
      */
     char ascii_disc_label[Libisoburn_disc_label_sizE];
+
+    /* HFS+ image serial number.
+     * 00...00 means that it shall be generated by libisofs.
+     */
+    uint8_t hfsp_serial_number[8];
+
 };