tests: track touch events in test-events
tests: track touch events in test-events

Enable xinput support in the X11 backend form test-events to
receive touch[begin|update|end] events.

https://bugzilla.gnome.org/show_bug.cgi?id=683869

collects/clutter,djdeath/clutter,Distrotech/clutter,GNOME/clutter,collects/clutter,jigpu/clutter,collects/clutter,djdeath/clutter,djdeath/clutter,collects/clutter,jigpu/clutter,heysion/clutter-clone,Distrotech/clutter,heysion/clutter-clone,djdeath/clutter,djdeath/clutter-android,djdeath/clutter-android,Distrotech/clutter,GNOME/clutter,GNOME/clutter,heysion/clutter-clone,ebassi/clutter,djdeath/clutter-android,Distrotech/clutter,jigpu/clutter,ebassi/clutter,Distrotech/clutter,djdeath/clutter-android,djdeath/clutter,collects/clutter,jigpu/clutter,Distrotech/clutter,jigpu/clutter,ebassi/clutter,jigpu/clutter,heysion/clutter-clone,djdeath/clutter-android,djdeath/clutter,GNOME/clutter,ebassi/clutter,heysion/clutter-clone,GNOME/clutter,ebassi/clutter