tinygo: repair hydra build

    owner = "tinygo-org";

    repo = "tinygo";

    rev = "v${version}";

    hash = "sha256-zoXruGoWitx6kietF3HKTYCtUrXp5SOrf2FEGgVPzkQ=";

    hash = "sha256-ehXkYOMQz6zEmofK+3ajwxLK9vIRZava/F3Ki5jTzYo=";

    fetchSubmodules = true;

    # The public hydra server on `hydra.nixos.org` is configured with

    # `max_output_size` of 3GB. The purpose of this `postFetch` step

    # is to stay below that limit and save 4.1GiB and 428MiB in output

    # size respectively. These folders are not referenced in tinygo.

    postFetch = ''

      rm -r $out/lib/cmsis-svd/data/{SiliconLabs,Freescale}

    '';

  };

  vendorHash = "sha256-rJ8AfJkIpxDkk+9Tf7ORnn7ueJB1kjJUBiLMDV5tias=";