Bug#1022232: libffi8 3.4.3-3 breaks all wayland clients on arm64/aarch64

[Lukas F. Hartmann]

I have identified the breaking patch, it is:
https://github.com/libffi/libffi/pull/739/files

Reverting debian/patches/739.diff and rebuilding the library fixes the
issue.

If possible, please drop this patch until the issue is addressed by
upstream.