Disable last test with NewThreadInvoker usage

Summary:
Windows does not seem to play by the rules with atexit, leaving NewThreadInvoker cleanup not working portably.
Some future work will be done to make cleanup work portably, but for now, disable the last remaining test
using NewThreadInvoker.

Reviewed By: elliotsegal-fb

Differential Revision: D55806373

fbshipit-source-id: 8a7734ac7ec7eb8a0b47da8723870f00fba138da

Author: graphicsMan

tests/future_test.cpp

@@ -655,7 +655,7 @@ TEST(Future, ImmediateInvoker) {
   EXPECT_EQ(7, val);
 }
 
-TEST(Future, NewThreadInvoker) {
+TEST(Future, DISABLED_NewThreadInvoker) {
   // Nearly always it should be better to use async/ThreadPool/TaskSet, but there may be occasions
   // where you actually want the work done on a new thread.
   dispenso::Future<int> future([]() { return 333; }, dispenso::kNewThreadInvoker);