gaugePlugins.go: Fix `error: attribute 'aarch64-linux' missing`

let

  otherArgs = lib.attrsets.removeAttrs args [ "pname" "data" "repo" "releasePrefix" "isMultiArch" ];

  inherit (stdenvNoCC.hostPlatform) system;

  inherit (if isCrossArch then data else data.${system}) url hash;

  inherit (if isCrossArch then data else data.${system} or (throw "gaugePlugins.${pname}: No source for system: ${system}")) url hash;

  # Upstream uses a different naming scheme for platforms

  systemMap = {

    "x86_64-darwin" = "darwin.x86_64";