message: [lldbsuite] Un-xfail TestEvents on Windows
  There are a couple of tests in TestEvents that are now passing.
diff: @@ -31,7 +31,6 @@ class EventAPITestCase(TestBase):
  @expectedFailureAll(
  oslist=["linux"],
  bugnumber="llvm.org/pr23730 Flaky, fails ~1/10 cases")
  - @skipIfWindows # This test will hang on windows llvm.org/pr21753
  def test_listen_for_and_print_event(self):
  """Exercise SBEvent API."""
  self.build()
  @@ -120,7 +119,6 @@ class EventAPITestCase(TestBase):
  @add_test_categories(['pyapi'])
  @expectedFlakeyLinux("llvm.org/pr23730") # Flaky, fails ~1/100 cases
  - @expectedFlakeyOS(oslist=["windows"])
  def test_wait_for_event(self):
  """Exercise SBListener.WaitForEvent() API."""
  self.build()
  @@ -199,7 +197,6 @@ class EventAPITestCase(TestBase):
  @expectedFailureAll(
  oslist=["linux"],
  bugnumber="llvm.org/pr23617 Flaky, fails ~1/10 cases")
  - @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24778")
  def test_add_listener_to_broadcaster(self):
  """Exercise some SBBroadcaster APIs."""
  self.build()
  