bug#13717: scrolling very fast makes emacs-nox segfault

[Troy Sankey]

Steps:
1. install GNU Emacs 24.2 (openSUSE 12.2)
2. delete ~/.emacs
3. open gnome-terminal (I'm using gnome-shell)
4. $ emacs-nox
5. scroll very fast -- I've tried both mouse wheel and touchpad
6. segfault

I can't get a proper backtrace because I don't have the appropriate
debugging symbols. I've installed emacs-debuginfo and
emacs-nox-debuginfo, but that did not help.

Troy