Motivation for this change

New mirage-crypto release.

Things done

• Removed cpuAcceleration argument of mirage-crypto (now acceleration support is checked at runtime and the compile time switch has been removed as it is obsolete now)
• Packaged new dependency mirage-unix and the new packages it requires:
  • io-page-unix (also updated io-page)
  • mirage-runtime (added in mirage-subfolder in case we want to package the other packages of that repository)
  • functoria-runtime (also updated functoria)
• Updated eqaf, since build fails with 0.6 (0.7 also introduces tests which require crowbar, I'll work on packaging crowbar in the near future)

Sorry for the big PR, unfortunately more or less required due to the big changes in the release.

cc @vbgl

• 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.