Help building for netbsd

[maxbekh]

Since we can ssh on old AirPort Extreme (and that I have a bunch of them) I wanted to give PPwn a try on these but I failed building for arm NetBsd 6
https://e17i.github.io/articles-timecapsule-crossbuild/
Could you help?

[Gouster4]

I was trying to build it on OPNSense which is FreeBSD based.
I found an issue during build process and filed in in this merge request.
#67

check if your error is same, and if it is, then it should work with this PR.