message: Add BPF target
  This change adds the bpfel-unknown-none and bpfeb-unknown-none targets
  which can be used to generate little endian and big endian BPF
diff: @@ -67,6 +67,7 @@ fn infer_from(
  LinkerFlavor::Msvc => "link.exe",
  LinkerFlavor::Lld(_) => "lld",
  LinkerFlavor::PtxLinker => "rust-ptx-linker",
  + LinkerFlavor::BpfLinker => "bpf-linker",
  }),
  flavor,
  )),
  