The new way to init `sound_group` and `sound_group_config` is currently
using a binding that doesn't match the miniaudio API.
The functions in miniaudio have an underscore between the `init` and `2`.
This fixes this.
Using `system:miniaudio` is suboptimal, we already provide the
`Makefile` that builds the `lib/miniaudio.a` and this works on MacOS.
This PR makes linking with that library the default.