[VirtualBox-kmod/el7] (5 commits) ...Fix VirtualBox-kmod for EL

Summary of changes: 00a771f... Add fixes for kernel 5.10 (*) 3c4ec01... We don't need build-sysbuild package when we just build the (*) f047357... Add fixes for Centos 8.4 (*) 17f74f0... Update to 6.1.18 (*) b2192e1... Fix VirtualBox-kmod for EL (*) (*) This commit already existed in another branch; no separate mail sent