[Cake] out of tree "cake" now buildable on multiple linux versions

[Toke Høiland-Jørgensen]

Dave Taht <dave.taht at gmail.com> writes:

> NOTE: I did not take the time to get the linux version checks exactly
> correct, but did manage to get it to compile on linux 3.13 and linux
> 3.18 without error, on x86_64.

Builds and loads on Arch Linux kernel 3.19.3 -- haven't tried running
it, would rather not crash my desktop just now... ;)

-Toke