Alberto Bertogli reported on #git that git-gui was exiting with alt-q, while gitk on the same system was exiting with ctrl-q. That was not what I wanted. I really wanted M1B to be bound to the Control key on most non-Mac OS X platforms, but according to Sam Vilain M1 on most systems means alt. Since gitk always does control, I'm doing the same thing for all non-Mac OS X systems.
Signed-off-by: Shawn O. Pearce <firstname.lastname@example.org>