Backed out changeset cec31de4e126

This was meant to migrate CoreAudio onto the same SDL_RunAudio() path that
most other audio drivers are on, but it introduced a bug because it doesn't
deal with dropped audio buffers...and fixing that properly just introduces
latency.

I might revisit this later, perhaps by reworking SDL_RunAudio to allow for
this sort of API better, or redesigning the whole subsystem or something, I
don't know. I'm not super-thrilled that this has to exist outside of the usual
codepaths, though.

Fixes Bugzilla #4481.

src/audio/SDL_audio.c

@@ -896,8 +896,6 @@ SDL_CaptureAudio(void *devicep)
         }
     }
 
-    current_audio.impl.PrepareToClose(device);
-
     current_audio.impl.FlushCapture(device);
 
     current_audio.impl.ThreadDeinit(device);