No longer compiles on plan9 #554
Description
This no longer compiles on plan9 which it used to.
This means that "github.com/prometheus/client_golang/prometheus" no longer compiles on plan9.
$ go get github.com/prometheus/procfs@master
$ GOOS=plan9 go build -v
github.com/prometheus/procfs
# github.com/prometheus/procfs
../../../../pkg/mod/github.com/prometheus/procfs@v0.11.1/fs_statfs_type.go:25:18: undefined: syscall.Statfs_t
../../../../pkg/mod/github.com/prometheus/procfs@v0.11.1/fs_statfs_type.go:26:17: undefined: syscall.Statfs