Motivation for this change

This adds a package for a small tool allowing streaming of audio on local networks. Using the current tip of the git repository instead of the latest release because adaptions to newer versions of ortp were done after the release.

Further work

The produced binaries currently produce a sched_setscheduler: Operation not permitted warning since they don't have permission to enable real time scheduling. I'm not sure if this should be allowed in the package, or by the user if needed. They work just fine nevertheless.

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 nox --run "nox-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.