v1.5.1

An experimental ski-efi binary was added. It's an EFI applicatiion
loader. See ski-efi/README.md for more details.

• New ski-efi binary to load EFI applications by Vladimir Serbinenko.

• Network device emulation switched from long deprecated PF_INET to
  AF_PACKET by Johnny Mnemonic.

• The build was fixed for glibc-2.42 systems where termio.h is no
  longer provided. Fix by Nicolas PARLANT.