message: nbd.nbd-file: Don't use `elle::fs`.
diff: +#include <fstream>
  +
  #include <boost/range/adaptor/transformed.hpp>
  #include <elle/das/cli.hh>
  @@ -63,10 +65,10 @@ public:
  void
  sync() override
  {
  - ::fdatasync(get_native_handle(this->_f));
  + ::fdatasync(std::filesystem::get_native_handle(this->_f));
  }
  - ELLE_ATTRIBUTE(elle::fs::fstream, f);
  + ELLE_ATTRIBUTE(std::fstream, f);
  };
  static
  @@ -93,7 +95,7 @@ _nbd_file(elle::fs::path path,
  server.listening().connect(
  [path = *port_file] (int port)
  {
  - elle::fs::fstream f(path, std::ios::out);
  + std::fstream f(path, std::ios::out);
  if (!f)
  elle::err("unable to open port file: {}", path);
  elle::print(f, "{}\n", port);
  