test: match gccgo error messages for bug358.go
test: match gccgo error messages for bug358.go

I fixed a bug in gccgo that was causing it to only give an
error for the first package that was imported and not used.

R=golang-dev, r
CC=golang-dev
http://codereview.appspot.com/6813058

wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,firebitsbr/golang-old,firebitsbr/golang-old,wesolows/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang,firebitsbr/golang-old,wesolows/golang,wesolows/golang,wesolows/golang,wesolows/golang-old,wesolows/golang-old