Motivation for this change

1. rev contained a branch rather than a tag.
2. Nix source paths have changed (Revert "fetchzip and friends: Set "name" to "source" by default" #31004 (comment)).
3. It depends on gcc 5, which is going to be updated in gcc: 5.4.0 -> 5.5.0 #31088.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-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.