add 64bit ABI names to libffi-win32 grovel file
add 64bit ABI names to libffi-win32 grovel file

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