[PATCH v2 1/1] add dkms configuration file dkms.conf

[Jason A. Donenfeld]

I like the general idea here of including dkim in WireGuard now, since
basically all distros use it and ship the exact same logic. By putting
it in WireGuard itself, I can provide maintenance over the
interworkings, which will be helpful for downstream.

Another thing I can do is handle the installation myself. `make dkim`
will then copy all the paths and create the dkim.conf file, etc. First
question: is there a standard destination path to which files should
be copied. Second question: what environment variable name do you
think would be appropriate for representing the destination address
(override)?