bug#19479: Copyright issue

[Glenn Morris]

I must say, that it was not my impression that disclaimers were not
accaptable for Emacs. Only that the FSF does not offer a "past and
future" option for disclaimers like it does for assignments, so a new
disclaimer would have to be completed for every new change. I thought
this was not worth bothering with, so I advised you not to send more patches.

But I certainly don't know, I just go with whatever assign@gnu says.

I don't see much point discussing this on emacs-devel. None of us are
lawyers so our opinions are pretty irrelevant. We need to wait and see
what assign@gnu says.