Fix rWrapper on darwin

[knedlsepp]

Motivation for this change

This should fix the rWrapper derivation on darwin.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[knedlsepp]

@GrahamcOfBorg build rWrapper

[GrahamcOfBorg]

No attempt on aarch64-linux (full log)

The following builds were skipped because they don't evaluate on aarch64-linux: rWrapper

Partial log (click to expand)

a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnfree = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowUnfree = true; }
to ~/.config/nixpkgs/config.nix.

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: rWrapper

Partial log (click to expand)

building
no Makefile, doing nothing
installing
post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/wjcrchq37cm9dgms8lg6iyspigbn4m68-R-3.5.0-wrapper
strip is /nix/store/21ymadblbmsbb2bk4q7gl4kjasp8zmgd-binutils-2.30/bin/strip
stripping (with command strip and flags -S) in /nix/store/wjcrchq37cm9dgms8lg6iyspigbn4m68-R-3.5.0-wrapper/bin
patching script interpreter paths in /nix/store/wjcrchq37cm9dgms8lg6iyspigbn4m68-R-3.5.0-wrapper
checking for references to /build in /nix/store/wjcrchq37cm9dgms8lg6iyspigbn4m68-R-3.5.0-wrapper...
/nix/store/wjcrchq37cm9dgms8lg6iyspigbn4m68-R-3.5.0-wrapper