Semi-automatic update. These checks were done:
- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 0.1.3 with grep in /nix/store/n6as7dvjq9vlsri84smc05yjmdvwmxww-soxr-0.1.3
- found 0.1.3 in filename of file in /nix/store/n6as7dvjq9vlsri84smc05yjmdvwmxww-soxr-0.1.3
- Using system-wide libs where we have them (except for portaudio, which
I couldn't make work).
- Add the soxr library (now the preferred way of audio resampling).
