[VirtualBox/el7] (11 commits) ...Remove Conflicts between subpackages server and guest-additions

Summary of changes: f376448... Rebuild for boost-1.66 (*) 4961a90... Enable GCC 8 support Use pkgconfig to get include/libs inst (*) cdabc63... Revert: Use pkgconfig to get include/libs instead of hardco (*) 4ad4540... Fix ChangeLog (*) 481f92a... - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass (*) 2e5fc7f... - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass (*) 5d1fcab... Update VBox to 5.2.8 (*) 06d396c... Review the new kmk configurations (*) f9b7ec2... Update the required version of kbuild (*) 3c62f12... fix minor spelling mistakes (*) 39e77c0... Remove Conflicts between subpackages server and guest-addit (*) (*) This commit already existed in another branch; no separate mail sent