test: Recognize gccgo error messages.
test: Recognize gccgo error messages.

bug278.go:18: error: invalid left hand side of assignment
bug278.go:19: error: array is not addressable
bug278.go:21: error: invalid left hand side of assignment
bug278.go:22: error: invalid left hand side of assignment

R=rsc
CC=golang-dev
http://codereview.appspot.com/2122042

h8liu/golang,ssrl/go,apparentlymart/golang,gnanderson/go,gnanderson/go,tv42/old-go,apparentlymart/golang,tv42/old-go,dsriram/golang,ssrl/go,tv42/old-go,ssrl/go,apparentlymart/golang,pombredanne/go-deleteme,apparentlymart/golang,h8liu/golang,h8liu/golang,pombredanne/go-deleteme,pombredanne/go-deleteme,h8liu/golang,tv42/old-go,tv42/old-go,dsriram/golang,ssrl/go,gnanderson/go,gnanderson/go,gnanderson/go,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,pombredanne/go-deleteme,gnanderson/go,pombredanne/go-deleteme,tv42/old-go,dsriram/golang,pombredanne/go-deleteme,ssrl/go,gnanderson/go,apparentlymart/golang,tv42/old-go,apparentlymart/golang,h8liu/golang,ssrl/go,dsriram/golang,h8liu/golang,h8liu/golang,ssrl/go,apparentlymart/golang,dsriram/golang