[arch-general] Update to 4.12.3-1 failed to rebuild DKMS virtualbox modules?

[David C. Rankin]

Update tonight to 4.12.3-1, and for the first time in years, DKMS failed to
rebuild the VirtualBox kernel modules. Specifically attempting a manual
# dkms install -m vboxhost -v 5.1.22

Solved,

Updated to vbox v5.1.26 and modules built fine.