Fix variadic DEFCFUNs. Moved call-by-value conditionalization to %DEFCFUN.
Fix variadic DEFCFUNs. Moved call-by-value conditionalization to %DEFCFUN.

Simplifies DEFCFUN, but due to the ACL-specific DEFCFUN-HELPER-FORMS hack,
this complicates %DEFCFUN a little bit.

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