windll event loop leaks

[Thomas Heller]

> > I will certainly give this a whirl. It doesn't provide a callback
> > generatr, but I suppose I can still use Sam's gencb.
> 
> Sure does it! It's just not yet documented, although I believe
> there are examples in the test directory.

Actually I lied! There's an empty 'callbacks' section in the manual,
but callbacks are later described under 'Functions': you actually
create a C compatible function, and hand the pointer over to somewhere
else.

Thomas