[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] No sound on Linux (#489)

[contrapunctus-1]

Apologies if this should have been a part of #360.

Running e.g. `AbstractSound bachFugue play` resulted in no sound. Other sound-playing applications on the system were working fine.

The VM said `sound: /dev/dsp: No such file or directory`

`--help` mentioned the following -
```
vm-sound-ALSA tryLoading cogspur/lib/squeak/5.0-202003021730/vm-sound-ALSA.so: dlopen: cogspur/lib/squeak/5.0-202003021730/vm-sound-ALSA.so: undefined symbol: snd_mixer_selem_is_active
vm-sound-ALSA tryLoading /home/anon/git/Cuis-Smalltalk/cogspur/lib/squeak/5.0-202003021730/vm-sound-ALSA.so: dlopen: /home/anon/git/Cuis-Smalltalk/cogspur/lib/squeak/5.0-202003021730/vm-sound-ALSA.so: undefined symbol: snd_mixer_selem_is_active
```

Running with -vm-sound-pulse gave no errors but I still got no sound.

OS - `Linux 5.5.0-1-686 #1 SMP Debian 5.5.13-2 (2020-03-30) i686 GNU/Linux`

```
$ cogspur/squeak --version
5.0-202003021730  Tue Mar  3 08:28:29 UTC 2020 gcc 5.4.0 [Production Spur VM]
CoInterpreter VMMaker.oscog-nice.2712 uuid: da64ef0b-fb0a-4770-ac16-f9b448234615 Mar  3 2020
StackToRegisterMappingCogit VMMaker.oscog-eem.2719 uuid: e40f3e94-3a54-411b-9613-5d19114ea131 Mar  3 2020
VM: 202003021730 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Date: Mon Mar 2 18:30:55 2020 CommitHash: 6a0bc96
Plugins: 202003021730 https://github.com/OpenSmalltalk/opensmalltalk-vm.git
Linux travis-job-56ef6ed6-a99c-4420-b3aa-37bf991d063a 4.15.0-1028-gcp #29~16.04.1-Ubuntu SMP Tue Feb 12 16:31:10 UTC 2019 i686 i686 i686 GNU/Linux
plugin path: cogspur/lib/squeak/5.0-202003021730 [default: /home/anon/git/Cuis-Smalltalk/cogspur/lib/squeak/5.0-202003021730/]
```

Cuis5.0-4112-32.image

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