Re: vibe.d-lite v0.2.0 with Windows support

[Kagamin via Digitalmars-d-announce]

```
if (cast(long)e.lpCompletionKey < 0) {
        fiber = fileWaiters[cast(int)-cast(long)e.lpCompletionKey];
}
```
Heh, if you didn't assume LP64, this would be another unsigned 
integer bug.