runtime: skip TestLldbPython

The test is broken on macOS Sierra.

Updates #17463.

Change-Id: Ifbb2379c640b9353a01bc55a5cb26dfaad9b4bdc
Reviewed-on: https://go-review.googlesource.com/31725
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/runtime/runtime-lldb_test.go

@@ -139,6 +139,7 @@ intvar = 42
 `
 
 func TestLldbPython(t *testing.T) {
+	t.Skip("issue 17463")
 	testenv.MustHaveGoBuild(t)
 	if final := os.Getenv("GOROOT_FINAL"); final != "" && runtime.GOROOT() != final {
 		t.Skip("gdb test can fail with GOROOT_FINAL pending")