runtime: skip broken TestRuntimeGogoBytes on windows

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/43730043

src/pkg/runtime/runtime_test.go

@@ -93,6 +93,10 @@ func BenchmarkDeferMany(b *testing.B) {
 // The value reported will include the padding between runtime.gogo and the
 // next function in memory. That's fine.
 func TestRuntimeGogoBytes(t *testing.T) {
+	// TODO(brainman): delete when issue 6973 is fixed.
+	if GOOS == "windows" {
+		t.Skip("skipping broken test on windows")
+	}
 	dir, err := ioutil.TempDir("", "go-build")
 	if err != nil {
 		t.Fatalf("failed to create temp directory: %v", err)