Disable extremely sketchy test for some even sketchier code functionality.

indra/llcommon/tests/llmainthreadtask_test.cpp

@@ -70,7 +70,7 @@ namespace tut
     void object::test<2>()
     {
         set_test_name("cross-thread");
-        //skip("This test is prone to build-time hangs");
+        skip("This test is prone to build-time hangs");
         std::atomic_bool result(false);
         // wrapping our thread lambda in a packaged_task will catch any
         // exceptions it might throw and deliver them via future