openvmtools: Update to version stable-12.0.0

openvmtools: Update to version stable-12.0.0

- Update from version stable-11.3.0 to stable-12.0.0
- Update of rootfile
- Changelog is a bit too long to include here. More details can be found at
    https://github.com/vmware/open-vm-tools/blob/stable-12.0.0/ReleaseNotes.md
    https://github.com/vmware/open-vm-tools/blob/stable-11.3.5/ReleaseNotes.md
- In version 11.3.5 mount.vmhgfs was removed from openvmtools
   It has been replaced by hgfs-fuse

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>