Updates to FFI spec: hs_init() & friends

[Alastair Reid]

> So, my proposal is to:
> [...]

Another possibility is to say that we don't really understand the
issues well enough to put in the standard yet and just comment out
that section.

I think only GHC implements anything like this (correct me if wrong,
Malcolm) and they haven't used it in the way John Meacham is
interested in.

Dunno... if you think we understand it well enough, go ahead.

A