New bootspec "gpt_disk_guid=", new -as mkisofs option --gpt_disk_guid, new -report_system_area mode "make_guid"

xorriso/base_obj.c

@@ -292,6 +292,8 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  m->appended_as_gpt= 0;
  m->appended_as_apm= 0;
  m->part_like_isohybrid= 0;
+ memset(m->gpt_guid, 0, 16);
+ m->gpt_guid_mode= 0;
  m->ascii_disc_label[0]= 0;
  m->grub2_sparc_core[0]= 0;
  memset(m->hfsp_serial_number, 0, 8);