xwayland: Provide fake cursor with subsurfaces

When the cursor position between the Wayland compositor and XWayland diverges
fake the cursor with a subsurface.

This is a workaround for X clients that try to move the cursor explicitly
through X11.

Signed-off-by: Roman Gilg <subdiff@gmail.com>
4 jobs for fake-cursor in 6 minutes and 37 seconds
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Status Job ID Name Coverage
  Docker Image
passed #2515698
debian-testing

00:00:29

 
  Build And Test
passed #2515699
autotools

00:06:07

passed #2515700
meson

00:02:19

passed #2515701
meson-noglamor

00:02:03