rewrite x86-64 libffi support

[Andreas Jaeger]

I'll do a detailed search now to double check that it's really your
patch and not something else...

Andreas
-- 
 Andreas Jaeger, aj@suse.de, http://www.suse.de/~aj
  SUSE Linux Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
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