Remove deprecated boot modes
The bios.syslinux.mbr, bios.syslinux.eltorito, uefi-ia32.grub.esp, uefi-ia32.grub.eltorito, uefi-x64.grub.esp, uefi-x64.grub.eltorito, uefi-ia32.systemd-boot.esp, uefi-ia32.systemd-boot.eltorito, uefi-x64.systemd-boot.esp and uefi-x64.systemd-boot.eltorito boot modes were deprecated in %v86.
mkarchiso shows a warning and replaces them with bios.syslinux, uefi.grub and uefi.systemd-boot.
When sufficient time has passed, support for the deprecated boot modes should be removed entirely.