Motivation for this change

Hi all, the latest master has been tagged as v0.7.10. Notable changes
include:

• Fixed several 'tup version' issues with bootstrapped or non-git tup
• Fixed several issues with clang on Windows
• Fixed an error in setting PGID for subprocesses (thanks Samuel!)
• Fixed a few issues with generated files that become normal
  (user-created) files
• Fixed an issue with ignored files and Visual Studio (thanks Aaron!)
• Improvements to 'tup generate' build scripts (thanks Michael!)
• Merged an old pull request for initial NetBSD support (thanks Kamil!),
  though more work is needed to get this working.
• Better support for 32-bit Windows builds (thanks nmlgc!)
• Now uses fuse3 by default on Linux, though fuse2 should still work.
  (Setting CONFIG_TUP_SERVER=fuse in tup.config will use fuse2 when building
  tup)

Thanks!
-Mike

Made Tup a multiple output-package. Tup goes to $bin and the setup hook goes to $out.

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.