New gccgo error message; match both compilers with one string.
New gccgo error message; match both compilers with one string.

8g:
runtime.go:19: cannot refer to unexported name runtime.printbool

gccgo:
runtime.go:19:10: error: invalid reference to unexported identifier ‘runtime.printbool’

R=rsc
CC=golang-dev
http://codereview.appspot.com/194157

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