message: Readme: Fix build instructions for Qemu
  Use make to be consistent with the gitlab pipeline.
  Without the objcpy after building the loader qemu fails at startup.
diff: @@ -157,7 +157,7 @@ After the installation of [xbuild](https://github.com/rust-osdev/cargo-xbuild),
  ```bash
  $ git clone https://github.com/hermitcore/rusty-loader.git
  $ cd rusty-loader
  -$ cargo xbuild --target x86_64-unknown-hermit-loader.json
  +$ make
  ```
  Afterwards, the loader is stored in `target/x86_64-unknown-hermit-loader/debug/` as `rusty-loader`.
  