x11: Add "pointer" to the is-not-a-touchscreen device name checks

Commit 1266d15c4 also broke Xwayland, as it does the same trick
than VMWare pointers. Let's extend the heuristic to check for "pointer"
in the device name, what can possibly go wrong...

https://bugzilla.gnome.org/show_bug.cgi?id=757358

gdk/x11/gdkdevicemanager-xi2.c

@@ -427,6 +427,7 @@ create_device (GdkDeviceManager *device_manager,
                strstr (tmp_name, "pen"))
         input_source = GDK_SOURCE_PEN;
       else if (!strstr (tmp_name, "mouse") &&
+               !strstr (tmp_name, "pointer") &&
                has_abs_axes (display, dev->classes, dev->num_classes))
         input_source = GDK_SOURCE_TOUCHSCREEN;
       else