libffi: ~500 of ~1200 tests fail

[Thomas Klausner <tk%giga.or.at@localhost>]

Hi!

I've just wanted to look at upstreaming the pkgsrc libffi patches to
https://github.com/atgreen/libffi when I found that currently over 500
of the 1200 tests fail (in an unmodified upstream code) on
7.99.1/amd64.

Is someone here knowledgeable enough on this topic to reduce this to a
manageable number?
 Thomas