[gccgo] Don't export top level function literals

[Ian Lance Taylor]

Given code like

var Usage = func() {
	fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
	PrintDefaults()
}

gccgo was exporting the function literal under the name __nested1.
That makes no sense.  Fixed with this patch which also avoids
namespace issues.  Committed to gccgo branch.

Ian

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