[Yhc] Libffi

[Neil Mitchell]

> Sadly that version doesn't compile in unix ... at least not without
> compiling *all* of ctypes (which is a lot for just libffi)

Is that make file issues, or the technical aspects of the code? If its
just makefile stuff, I am sure our expert scons person will sort it
out with a scons script. The windows copy can be built rather easily
on its own.

Of course, using two different copies of libffi for the different
platforms is just asking for trouble...

Thanks

Neil