rocmPackages: don't build arches in parallel in rccl

    # Really strange behavior, `#!/usr/bin/env perl` should work...

    substituteInPlace CMakeLists.txt \

      --replace "\''$ \''${hipify-perl_executable}" "${perl}/bin/perl ${hipify}/bin/hipify-perl"

      --replace "\''$ \''${hipify-perl_executable}" "${perl}/bin/perl ${hipify}/bin/hipify-perl" \

      --replace-warn "-parallel-jobs=12" "-parallel-jobs=1" \

      --replace-warn "-parallel-jobs=16" "-parallel-jobs=1"

  '';

  postInstall = lib.optionalString buildTests ''