Copy libffi from sxemacs

[Aidan Kehoe]

 Ar an dara lá de mí Meitheamh, scríobh Jeff Sparkes: 

 > Now that RMS has approved GCC's use of dynamically loading plugins, we
 > should add FFI to xemacs.

RMS’ decision on this is irrelevant to us, his delay over this decision is
why we have #'load-module and GNU doesn’t. 

 > My understanding is that the sxemacs uses libffi for this.  Could this
 > easily be copied into XEmacs?

Relatively easily; see http://hg.debian.org/hg/xemacs/xemacs-ffi/ . I
couldn’t get that to run on OS X a few months ago, though I imagine it works
on Linux. More work needed.

-- 
“Apart from the nine-banded armadillo, man is the only natural host of
Mycobacterium leprae, although it can be grown in the footpads of mice.”
  -- Kumar & Clark, Clinical Medicine, summarising improbable leprosy research