go.talks/pkg/socket: send compiler output to stderr
go.talks/pkg/socket: send compiler output to stderr

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7300044

Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks,Karthikvb/talks