Skip test if spa lib is not installed
This MR adds logic in the unit tests to skip the test if the used PipeWire SPA library is not installed, avoiding the test to fail if pipewire was build without the used SPA libraries.
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This MR adds logic in the unit tests to skip the test if the used PipeWire SPA library is not installed, avoiding the test to fail if pipewire was build without the used SPA libraries.