New comment by unspecd on void-packages repository

https://github.com/void-linux/void-packages/pull/34315#issuecomment-982025213

Comment:
They use octave, but the signal processing package is missing.
```
$ octave-cli
octave:1> pkg load signal
error: package signal is not installed
error: called from
    load_packages at line 47 column 7
    pkg at line 588 column 7
```

https://github.com/drowe67/codec2:
> 1. Install GNU Octave and libraries on Ubuntu with:
>
> sudo apt install octave octave-common octave-signal liboctave-dev gnuplot python3-numpy sox valgrind