[VirtualBox/el7] (7 commits) ...Correct fix for perl in Rawhide

Summary of changes: e7a4fbc... Minor fix in update_vbox.sh (*) 08c55da... Add a hack to fix builds on Rawhide/F32 (*) 6b82dca... Fixes_for_kernel 5.6 from https://build.opensuse.org/pack (*) e83731c... Add Clipboard.patch for guest in epel7 (*) 2b5a71f... Fix build in rawhide (*) 8f2f012... Fixes for kernel 5.6 just applied on Fedora (*) 0729a93... Correct fix for perl in Rawhide (*) (*) This commit already existed in another branch; no separate mail sent