This update for virtualbox fixes the following issues:

Update to VirtualBox 5.2.18 (boo#1105201), containing multiple upstream bug fixes:

- VMM: fix loading with recent binutils and self-built versions of VirtualBox
- NAT: fix --nataliasmode sameports which is a valid setting
- VRDP: fixed VM process termination on RDP client disconnect if 3D is enabled for the virtual machine