fakeroot: fix Darwin by applying an additional patch from Brew

[mroi]

I was testing cross-building of Linux Docker images on macOS hosts. It almost works except for a runtime linker error with libfakeroot. The reason is that the patchset ported over from Brew is currently incomplete. One additional patch is missing, but it needs to be applied to a generated file, so an intermediate make as to run first.

I ported the change from the fakeroot Brew formula. The patch is explained upstream.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• 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 nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[r-rmcgibbo]

Result of nixpkgs-review pr 122832 at a474001 run on aarch64-linux 1

4 packages built successfully:

• autofs5
• fakeroot
• hylafaxplus
• sssd

---

Result of nixpkgs-review pr 122832 at a474001 run on x86_64-linux 1

6 packages built successfully:

• autofs5
• cdesktopenv
• fakeroot
• hylafaxplus
• sssd
• virtualboxWithExtpack

4 suggestions:

• warning: missing-patch-comment

  Consider adding a comment explaining the purpose of this patch on the line preceeding.
  Near pkgs/tools/system/fakeroot/default.nix:20:5:

     |
  20 |     (fetchpatch {
     |     ^
  

• warning: missing-patch-comment

  Consider adding a comment explaining the purpose of this patch on the line preceeding.
  Near pkgs/tools/system/fakeroot/default.nix:15:5:

     |
  15 |     (fetchpatch {
     |     ^
  

• warning: missing-patch-comment

  Consider adding a comment explaining the purpose of this patch on the line preceeding.
  Near pkgs/tools/system/fakeroot/default.nix:25:5:

     |
  25 |     (fetchpatch {
     |     ^
  

• warning: build-tools-in-build-inputs

  getopt is a build tool so it likely goes to nativeBuildInputs, not buildInputs.

  Near pkgs/tools/system/fakeroot/default.nix:32:3:

     |
  32 |   buildInputs = [ getopt gnused ]
     |   ^