libffi: new typedef for return value

[Tom Tromey]

>>>>> "Jeff" == Jeff Sturm <jsturm@one-point.com> writes:

Jeff> Tom, what was your other must-have for 3.1?

1. There's a gcc crash in the new builtins code.
   It might have already been fixed but I haven't verified.

2. AG reported a gcj crash when building part of rhug.
   Jakub is looking at this one.

There are plenty of other important bugs but those are the only ones I
consider critical.  The rest I hope we'll fix in 3.2.  Of course
discussion on what is critical is always open... feel free to point
out anything you think I've missed.  I've been worn down a bit by the
volume of bugs, and I find I no longer get too worked up over trying
to fix every bug in the next release.  gcc seems to be on a better
schedule now, so waiting a release isn't very painful.

Tom