x/sys/unix: ztypes_linux outdated: unix.NHA_UNSPEC undefined

[taktv6]

What version of Go are you using (go version)?

$ go version go1.13.4 linux/amd64

Does this issue reproduce with the latest release?

Yes. Even master branch is outdated.

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE="on"
GOARCH="amd64"
GOBIN=""
GOCACHE="****"
GOENV="***"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GONOPROXY="*****"
GONOSUMDB="*****"
GOOS="linux"
GOPATH="*****"
GOPRIVATE="*****"
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/go"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/linux_amd64"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="****"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build502358925=/tmp/go-build -gno-record-gcc-switches"

What did you do?

I've tried to use constants used in recent Linux versions.
See https://elixir.bootlin.com/linux/latest/source/include/uapi/linux/nexthop.h.

What did you expect to see?

Definitions for stuff like NHA_* (NHA_UNSPEC, NHA_ID,..., /include/uapi/linux/nexthop.h)

What did you see instead?

unix.NHA_UNSPEC undefined. etc.

[gopherbot]

Change https://golang.org/cl/227357 mentions this issue: unix: add nexthop types and consts