Fixes some fallback paths so audacium can find things like nyquist plugins on 'nix
[ x ] I made sure the code compiles on my machine.
[ x ] I made sure there are no unnecessary changes in the code.
[ x ] I made sure the title of the PR reflects the core meaning of the issue you are solving.
[ x ] I made sure the commit message(s) contain a description and answer the question "Why do those changes fix that particular issue?" or "Why are those changes really necessary as improvements?".
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Fixes some fallback paths so audacium can find things like nyquist plugins on 'nix
GPL-2.0-or-later).