bug#22975: 25.0.92; CANNOT_DUMP build can't start in tty mode

[Stefan Monnier]

>> Actually, I think this problem goes much further.  Maybe we're lucky
>> right now and we don't hit any other such cases, but we just shouldn't
>> try to do any "terminal" output until loadup is loaded.
> Can you elaborate?  Which other problems do you envision?

None in particular.  I just think it would be safer.

Most of Emacs's code is written under the assumption that all of
loadup.el is already loaded, so we should run as little code as possible
during loadup.el itself.


        Stefan