cmd/go: skip consistent cgo build test on Solaris.

See #13247.

Change-Id: I06636157028d98430eb29277c822270592907856
Reviewed-on: https://go-review.googlesource.com/19910Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/go/go_test.go

@@ -2763,6 +2763,10 @@ func TestCgoConsistentResults(t *testing.T) {
 	if !canCgo {
 		t.Skip("skipping because cgo not enabled")
 	}
+	if runtime.GOOS == "solaris" {
+		// See https://golang.org/issue/13247
+		t.Skip("skipping because Solaris builds are known to be inconsistent; see #13247")
+	}
 
 	tg := testgo(t)
 	defer tg.cleanup()