audio: Handle non-power-of-two spec.samples when unsupported

Fixes #3685

src/audio/pulseaudio/SDL_pulseaudio.c

@@ -945,6 +945,7 @@ PULSEAUDIO_Init(SDL_AudioDriverImpl * impl)
     impl->GetDefaultAudioInfo = PULSEAUDIO_GetDefaultAudioInfo;
 
     impl->HasCaptureSupport = SDL_TRUE;
+    impl->SupportsNonPow2Samples = SDL_TRUE;
 
     return SDL_TRUE;   /* this audio target is available. */
 }