Motivation for this change

This simply removes all the unnecessary build dependencies for the afl-patched qemu. It looks like it was initially a copy of the regular qemu package, but afl only uses qemu in a very minimal manner (e.g. it doesn't even use system mode). So I trimmed this down to what seems to be the bare minimum with a process of trial and error.

Also added myself to the maintainers list for afl as I've tinkered with this package quite a bit now.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• 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 nix-review --run "nix-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)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.