update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/src/audio/SDL_audio.c

@@ -104,6 +104,9 @@
#if SDL_AUDIO_DRIVER_JACK
    &JACK_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_OS2
    &OS2AUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_DISK
    &DISKAUDIO_bootstrap,
#endif
@@ -574,7 +577,7 @@

    if (len > 0) {  /* fill any remaining space in the stream with silence. */
        SDL_assert(SDL_CountDataQueue(device->buffer_queue) == 0);
        SDL_memset(stream, device->spec.silence, len);
        SDL_memset(stream, device->callbackspec.silence, len);
    }
}

@@ -730,7 +733,7 @@
        /* !!! FIXME: this should be LockDevice. */
        SDL_LockMutex(device->mixer_lock);
        if (SDL_AtomicGet(&device->paused)) {
            SDL_memset(data, device->spec.silence, data_len);
            SDL_memset(data, device->callbackspec.silence, data_len);
        } else {
            callback(udata, data, data_len);
        }