Build fails on go1.11

[imrehg]

Description

Building balena on ArchLinux, which ships go 1.11 now by default, results in relocation target runtime.support_avx not defined and relocation target runtime.support_avx2 not defined errors from go crypto.

Steps to reproduce the issue:

1. On ArchLInux (or any other system) install go 1.11
2. build balena according to to instructions

Describe the results you received:

...
---> Making bundle: binary-balena (in bundles/binary-balena)
Building: bundles/binary-balena/balena-v17.12.0-9-gebfc24009
# github.com/docker/docker/cmd/balena
github.com/docker/docker/vendor/golang.org/x/crypto/blake2b.supportsAVX2: relocation target runtime.support_avx2 not defined
github.com/docker/docker/vendor/golang.org/x/crypto/blake2b.supportsAVX: relocation target runtime.support_avx not defined

Describe the results you expected:

Balena building correctly.

Additional information you deem important (e.g. issue happens only occasionally):

$ go version  
go version go1.11 linux/amd64

Version info

Building v17.12.0-9-gebfc24009, that is the current tip of the 17.12-resin branch.

Additional environment details (AWS, VirtualBox, physical, etc.):

ArchLinux up to date version, building this package https://aur.archlinux.org/packages/balena/

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