Lack of AU destruction in one of the two AU APIs

```
if (select == kComponentCloseSelect) // -2
{
destroyFree(cast(void*)this); // free all resources except the runtime
releaseAUFunctions();
return noErr;
}
```

I'm not sure why it's cast to void*, probably the former destruction code would work but not the newer.

Compare the two AU API destruction paths, starting with the kComponentCloseSelect branch shown in the issue. Check why this path uses destroyFree(cast(void*)this) before releaseAUFunctions(), and verify that both APIs consistently destroy resources and release AU functions.

Written by the indexing model from the issue text.