Code review comment for ~mirespace/ubuntu/+source/libmail-dkim-perl:reverting-upstream-debian-ed25519-noble-proposed

I understand completely that the patches way could be more risky and are ugly/tedious/horrible/madness to inspection.

(ofi) I did the patches 1-5 with git format-patch -5 HEAD from marcbrashaw/ed25519 (upstream/ed25519) branch, I didn't do it manually