Holds an updated version of libffi to avoid build errors and warnings with Xcode 5, meant to replace the version used by GHC in the libffi-tarballs directory of a GHC checkout.
It's a .tar.gz of https://github.com/zwaldowski/libffi which holds the fixes described in https://github.com/atgreen/libffi/pull/19