bug#23369: 25.0.93; CANNOT_DUMP build fails if resizing terminal during startup in tty mode

[Glenn Morris]

Eli Zaretskii wrote:

> Fredrik, does this patch solve the problems you see? 

Remember to rebuild window.elc after applying.

> If so, I think we should install it on the emacs-25 branch.

It's ugly to (essentially) modify all uses of save-selected-window just
because of one (?) problematic use in an edge case. I wonder if we can
find and fix whatever code is calling it in this case. Presumably
something window-related that happens during resizing.

Also, it seems like if CANNOT_DUMP builds encounter an error loading
loadup.el, they go on to run the command-loop with only a partially
loaded loadup, which leads to confusing error messages that have nothing
to do with the real problem. Can they be made to abort instead?