bug#16196: 24.3.50; Disable ding when scrolling

[Eli Zaretskii]

> From: Jan Djärv <jan.h.d@swipnet.se>
> Date: Fri, 20 Dec 2013 19:48:57 +0100
> Cc: 16196@debbugs.gnu.org
> 
> >  That'd be a serious change of behavior, so it
> > should be discussed and/or users polled before we do that, I think.
> 
> Best make it an option then.  Does not require polling.

I don't think an option will raise any objections.  Patches welcome.