[Linux] Hang on closing content when a core uses the Alsathread microphone driver

[ds22x]

Description

As discovered here, when a core actively uses the "Alsathread" microphone driver, it will hang when closing content.
Using either the "Alsa" or "SDL2" drivers will work just fine.
So far it only occurs with the new MelonDS DS core (as it's currently the only core that uses the microphone api), but according to @JesseTG, it might be something that needs to be fixed within the API itself.

Version/Commit

You can find this information under Information/System Information

• RetroArch: [1.16.0.3 2e86748]

Environment information

• OS: SteamOS 3.5.13

[Sanaki]

I can't reproduce this on my desktop with self-compiled retroarch, but I can reproduce it on the steam build on steam deck.