test: match gccgo error messages for bug274.go.
test: match gccgo error messages for bug274.go.

bug274.go:23:3: error: missing statement after label
bug274.go:25:3: error: missing statement after label
bug274.go:28:3: error: label ‘L2’ defined and not used

R=rsc
CC=golang-dev
http://codereview.appspot.com/4273114

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