Motivation for this change

massiv* packages are marked as broken. Turns out it is only a test issue. An upstream patch has been accepted to fix this in the next massiv release. This pull disables the massiv test in the meantime.

It also unmarks broken from all the associated packages and dependencies as they appear to be fine after this change (i.e., the resulting libraries build with nix build and work at least well enough to at least run some basic image code I wrote that uses the massiv package).

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.