[VirtualBox-kmod/f24] (4 commits) ...Update VBox to 5.1.6

[Sérgio M. Basto]

Summary of changes:

  7f6775f... Update VBox to 5.1.4 (*)
  914b475... Force use VirtualBox-kmodsrc >= 5.1.4-3 (*)
  c5463c8... Force use VirtualBox-kmodsrc >= 5.1.4-4, with fix for 4.8.0 (*)
  0ba94aa... Update VBox to 5.1.6 (*)

(*) This commit already existed in another branch; no separate mail sent