geofence: remove fence & fence_vertex messages

- this was never read
- it was implemented wrong, leading to memory access violations in
  publishFence (an integer was passed instead of the fence_s struct)

msg/CMakeLists.txt

@@ -55,8 +55,6 @@ set(msg_file_names
 	esc_report.msg
 	esc_status.msg
 	estimator_status.msg
-	fence.msg
-	fence_vertex.msg
 	filtered_bottom_flow.msg
 	follow_target.msg
 	fw_pos_ctrl_status.msg