Revert "update libffi"

This reverts commit d54d17d686b4e8cbd317f0a84daef5a2ea5a88f0.
Revert "update submodule"

This reverts commit c6bd84dc1d3013b6e5bc8a68720fdab9cd3b4310.
Revert "update submodule"

This reverts commit 13bfdafb7ac1288cb594431df2b746ea083fb762.
Revert "convert module to xcode 5"

This reverts commit 255d0d7d9c9e0ee8eb91facffbcdbb8ddc18f76a.
Revert "Schemes updated."

This reverts commit 03deae46ea537eedf2af04531598dae133d838e7.