[VirtualBox/el8] (5 commits) ...Update VirtualBox to 6.1.28 with inspirations in the Mageia and Debian packages

Summary of changes: 783bf98... Fix build on rawhide (disabling python) and BR alsa-lib-dev (*) 34796e5... On create vm defaults to Linux and minor improvements (*) 3f51209... Fix vendor (*) dd3aacd... Update VirtualBox to 6.1.28 (*) a8c4f87... Update VirtualBox to 6.1.28 with inspirations in the Mageia (*) (*) This commit already existed in another branch; no separate mail sent