[VirtualBox/el7] (12 commits) ...Install the new VBoxDRMClient binary for guest-additions

Summary of changes: 7a3307d... Add wildcard in gitignore (*) fd42811... Add VirtualBox-6.1.0-VBoxRem.patch rfbz #5652 Remove pre-co (*) 382840b... Rebuild for python-3.9 (*) 46960e3... Add python-3.9 support (*) 534430e... Fix build on EL8 (*) 2f1555a... Update VBox to 6.1.10 (*) da592e9... Minor fixes (*) 58f90db... Only in epel7 run the scriptlets of Icon Cache, mimeinfo an (*) 1ab2955... Update helper script (*) 5b42b94... Rfbz #3966, not using anymore systemd-modules-load.service (*) d773823... Drop wayland-crash patch and fix wrong path to (*) d6a670b... Install the new VBoxDRMClient binary for guest-additions (*) (*) This commit already existed in another branch; no separate mail sent