audio: Removed unused AllowsArbitraryDeviceNames variable.

src/audio/SDL_sysaudio.h

@@ -143,7 +143,6 @@ typedef struct SDL_AudioDriverImpl
     SDL_bool HasCaptureSupport;
     SDL_bool OnlyHasDefaultOutputDevice;
     SDL_bool OnlyHasDefaultCaptureDevice;
-    SDL_bool AllowsArbitraryDeviceNames;
 } SDL_AudioDriverImpl;
 
 typedef struct SDL_AudioDriver

src/audio/disk/SDL_diskaudio.c

@@ -160,7 +160,6 @@ static SDL_bool DISKAUDIO_Init(SDL_AudioDriverImpl *impl)
     impl->CloseDevice = DISKAUDIO_CloseDevice;
     impl->DetectDevices = DISKAUDIO_DetectDevices;
 
-    impl->AllowsArbitraryDeviceNames = SDL_TRUE;
     impl->HasCaptureSupport = SDL_TRUE;
 
     return SDL_TRUE;

src/audio/dsp/SDL_dspaudio.c

@@ -293,7 +293,6 @@ static SDL_bool DSP_Init(SDL_AudioDriverImpl *impl)
     impl->CaptureFromDevice = DSP_CaptureFromDevice;
     impl->FlushCapture = DSP_FlushCapture;
 
-    impl->AllowsArbitraryDeviceNames = SDL_TRUE;
     impl->HasCaptureSupport = SDL_TRUE;
 
     return SDL_TRUE; /* this audio target is available. */

src/audio/netbsd/SDL_netbsdaudio.c

@@ -317,7 +317,6 @@ static SDL_bool NETBSDAUDIO_Init(SDL_AudioDriverImpl *impl)
     impl->FlushCapture = NETBSDAUDIO_FlushCapture;
 
     impl->HasCaptureSupport = SDL_TRUE;
-    impl->AllowsArbitraryDeviceNames = SDL_TRUE;
 
     return SDL_TRUE;
 }

src/audio/sndio/SDL_sndioaudio.c

@@ -348,7 +348,6 @@ static SDL_bool SNDIO_Init(SDL_AudioDriverImpl *impl)
     impl->Deinitialize = SNDIO_Deinitialize;
     impl->DetectDevices = SNDIO_DetectDevices;
 
-    impl->AllowsArbitraryDeviceNames = SDL_TRUE;
     impl->HasCaptureSupport = SDL_TRUE;
 
     return SDL_TRUE;