runtime/pprof: disable test on Leopard 64-bit

Fixes #3234.

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5756078

src/pkg/runtime/pprof/pprof_test.go

@@ -24,8 +24,9 @@ func TestCPUProfile(t *testing.T) {
 		}
 		vers := string(out)
 		t.Logf("uname -a: %v", vers)
-		if strings.Contains(vers, "Darwin Kernel Version 10.8.0") && strings.Contains(vers, "root:xnu-1504.15.3~1/RELEASE_X86_64") {
-			t.Logf("skipping test on known-broken kernel (64-bit Snow Leopard)")
+		// Lion uses "Darwin Kernel Version 11".
+		if strings.Contains(vers, "Darwin Kernel Version 10") && strings.Contains(vers, "RELEASE_X86_64") {
+			t.Logf("skipping test on known-broken kernel (64-bit Leopard / Snow Leopard)")
 			return
 		}
 	case "plan9":