[VirtualBox/f32] (6 commits) ...Install the new VBoxDRMClient binary for guest-additions

Summary of changes: 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