go.crypto: various: fix appengine compatibility

Fixes golang/go#4102.

R=russross, minux.ma, rsc, agl
CC=golang-dev
https://golang.org/cl/6623053
1 file changed
tree: 62afe736a4640ddd2d908658c93976dabad74db3
  1. terminal.go
  2. terminal_test.go
  3. util.go