unpackFile: ignore timestamp warnings

[milahu]

in rare cases, tar xf somefile.tar says "time stamp is in the future" or "implausibly old time stamp"

for example in fetchipfs #136688 → ipfs/kubo#8406 and golang/go#48275

these warnings should be safe to ignore

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all packages 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/)
• 21.11 Release Notes (or backporting 21.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

[dasJ]

Maybe target the staging branch with this

[Artturin]

both work

nix build ".#mate.marco.src"
xz -d < result | tar xf - --warning=no-timestamp

nix build ".#streamripper.src"
tar xf result --warning=no-timestamp

and coreutils builds