SDL should check if pipewire actually has a working sound server

I ran into a problem with the eden appimage [here](https://git.eden-emu.dev/eden-ci/nightly/releases) that I had no sound. The reason this happened is because eden has SDL statically linked, and it ends up trying to use pipewire: <img width="705" height="220" alt="Image" src="https://github.com/user-attachments/assets/a668b08e-a779-4cb6-b9b8-b4a1153e78c3" /> And while my system has `libpipewire-0.3.so` **I don't have pipewire audio**, I use pulseaudio/alsa instead, manually setting `SDL_AUDIODRIVER=pulseaudio` (or `alsa`) fixes the problem. pipewire is used for more stuff than just audio, SDL should check that there is actually pipewire audio and not just rely on the lib being dlopened.