Comment 8 for bug 1417980

Installing xserver-xorg-input-libinput is necessary to get Touchpad options to show in gnome-control-center 3.20.

Because of this:
https://bugzilla.gnome.org/show_bug.cgi?id=759595

https://git.gnome.org/browse/gnome-settings-daemon/commit/?id=66c211ff24be

Mentioning here because I assume we'd want to switch to libinput before doing that package upgrade or instead maybe we could just revert that change temporarily.