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

apparentlymart/golang,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,apparentlymart/golang,tv42/old-go,apparentlymart/golang,gnanderson/go,tv42/old-go,tv42/old-go,tv42/old-go,gnanderson/go,apparentlymart/golang,pombredanne/go-deleteme,apparentlymart/golang,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,pombredanne/go-deleteme,gnanderson/go,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,apparentlymart/golang,apparentlymart/golang