Make the point that OpenBSD as W^X by default, which would stymy IFUNC

[robertdfrench]

Also, this is why OpenSSH devs would never consider this mode of attack, even if someone needed to link OpenSSH against another library for some reason. It just wasn't in the threat model at all.

[robertdfrench]

Confusion about RELRO here, I think. This might not make a real difference.