[Pkg-dkms-maint] Bug#663114: zfsonlinux modules would also benefit from this

[Andras Korn]

Building the zfsonlinux modules on a 24 core box takes more than 4 minutes.
For comparison, I can build the entire kernel in about 2, with -j24.

I tried to force dkms to use -j24 by editing /usr/sbin/dkms, but I failed (I
hard-coded this flag in all places where it seemed pertinent, but it didn't
help - I guess I would need to learn how dkms works).

Andras

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