go/internal/gccgoimporter: test fix for older gccgo versions

Import test fix https://golang.org/cl/153831 from std lib
version (skips issue29198.go test for older versions of gccgo).

Updates golang/go#29198.

Change-Id: Iddd903068a73a307b1d19d93a7c03b1d00365022
Reviewed-on: https://go-review.googlesource.com/c/153870
Run-TryBot: Than McIntosh <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: thanm

go/internal/gccgoimporter/importer_test.go

@@ -162,7 +162,7 @@ func TestObjImporter(t *testing.T) {
 
 	for _, test := range importerTests {
 		// Support for type aliases was added in GCC 7.
-		if test.pkgpath == "aliases" || test.pkgpath == "issue27856" {
+		if test.pkgpath == "aliases" || test.pkgpath == "issue27856" || test.pkgpath == "issue29198" {
 			if major < 7 {
 				t.Logf("skipping %q: not supported before gccgo version 7", test.pkgpath)
 				continue