Break out defcfun-args-from-ff-args as a separate function
Break out defcfun-args-from-ff-args as a separate function

Break out defcfun-args-from-ff-args as a separate function, and export
it, because it's useful for GSLL and maybe other users as well.

stassats/cffi,attila-lendvai/cffi,stassats/cffi,cffi/cffi,mcna/cffi,attila-lendvai/cffi,3b/cffi,cffi/cffi,3b/cffi,dkochmanski/cffi,cffi/cffi,dkochmanski/cffi,3b/cffi,stassats/cffi,dkochmanski/cffi,mcna/cffi