x/sys/cpu: cpu_arm64.go:39:22: undefined: HWCap

[karalabe]

We've been hitting compilation issues on iOS arm64 for the past few months. I've just upgraded to the latest code today, but builders are failing with golang.org/x/sys/cpu/cpu_arm64.go:39:22: undefined: HWCap. Could anyone look into this?

https://travis-ci.org/ethereum/go-ethereum/jobs/493330332#L1207

[AlexRouSg]

Looks like golang.org/x/sys/cpu currently only supports Linux on non x86 processors.

ping @tklauser

[gopherbot]

Change https://golang.org/cl/162797 mentions this issue: cpu: fix build for GOARCH=arm64 on GOOS!=linux

[karalabe]

Thank you, builders are green again!