Summary of changes:
7e3c01f... Allow to build pre-built kmod on el (*)
a8cd825... Add changelog (*)
776f461... Add patch for kernel 4.12 (*)
909eae5... Add patch for kernel_4.13_rc1 (*)
7f34070... Update VBox to 5.1.22 (*)
(*) This commit already existed in another branch; no separate mail sent