implement new callback interface for cmucl
implement new callback interface for cmucl

Unsolved problems still prevent CFFI from working in a saved image
on CMU CL.

attila-lendvai/cffi,akovalenko/cffi,mcna/cffi,dkochmanski/cffi,marsijanin/cffi,3b/cffi,kingcheez/cffi-cheez,kingcheez/cffi-cheez,dochang/cffi,wesen/cffi,attila-lendvai/cffi,akovalenko/cffi,mcna/cffi,cffi/cffi,cffi/cffi,cffi/cffi,akovalenko/cffi,dkochmanski/cffi,marsijanin/cffi,marsijanin/cffi,dkochmanski/cffi,stassats/cffi,wesen/cffi,stassats/cffi,kingcheez/cffi-cheez,stassats/cffi,3b/cffi,dochang/cffi,dochang/cffi,wesen/cffi,3b/cffi