misc/cgo/test: check API compatibility for cgo pseudo-functions
misc/cgo/test: check API compatibility for cgo pseudo-functions

R=golang-dev, iant
CC=golang-dev
https://codereview.appspot.com/9826043

h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang,h8liu/golang