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

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