test: match gccgo error messages for bug349.go

bug349.go:12:14: error: expected ‘;’ or ‘}’ or newline
bug349.go:12:2: error: not enough arguments to return

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5081047

test/fixedbugs/bug349.go

@@ -9,5 +9,5 @@
 package main
 
 func foo() (a, b, c int) {
-	return 0, 1 2.01  // ERROR "unexpected literal 2.01"
+	return 0, 1 2.01  // ERROR "unexpected literal 2.01|expected ';' or '}' or newline|not enough arguments to return"
 }