Squashed 'ffi-mini/' changes from 3cee33a..e0505aa

e0505aa libffi v3.0.14-rc0-WIP3: zwaldowski/libffi-iOS@45e0a3e

git-subtree-dir: ffi-mini
git-subtree-split: e0505aa787634fe48dbd1ab8a44c6586e7dd9256
Merge commit '53327b97fa38ca09d11357fe658724db4ccd8b0a' into next