Add stdcall support for callbacks in Clozure CL.
Add stdcall support for callbacks in Clozure CL.

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