message: lazy_static includes already the spin crate and libhermit does not use it
  => we can remove the spin crate from Cargo.toml
diff: @@ -35,7 +35,6 @@ bitflags = "1.2"
  #cfg-if = "0.1"
  #byteorder = { version = "1.0", default-features = false }
  lazy_static = { version = "1.4.0", default-features = false, features = ["spin_no_std"] }
  -spin = { version = "0.5.2", optional = true }
  [dependencies.log]
  version = "0.4"
  