tarfile.cc: Restore timestamps
tarfile.cc: Restore timestamps

This is needed to get the lastModified attribute of GitHub flakes.

NixOS/nix,ehmry/nix,rycee/nix,ehmry/nix,ehmry/nix,NixOS/nix,pikajude/nix,ehmry/nix,rycee/nix,pikajude/nix,NixOS/nix,rycee/nix,rycee/nix,pikajude/nix,ehmry/nix,NixOS/nix,NixOS/nix,ehmry/nix,rycee/nix