R: patchelf libraries missing libR.so (#354819)

  # The store path to "which" is baked into src/library/base/R/unix/system.unix.R,

  # but Nix cannot detect it as a run-time dependency because the installed file

  # is compiled and compressed, which hides the store path.

  postFixup = "echo ${which} > $out/nix-support/undetected-runtime-dependencies";

  postFixup = ''

    echo ${which} > $out/nix-support/undetected-runtime-dependencies

    ${lib.optionalString stdenv.hostPlatform.isLinux ''find $out -name "*.so" -exec patchelf {} --add-rpath $out/lib/R/lib \;''}

  '';

  doCheck = true;

  preCheck = "export HOME=$TMPDIR; export TZ=CET; bin/Rscript -e 'sessionInfo()'";