[lldb] Disable the new Communication test on windows

The ConnectionFileDescriptor class on windows does not support
interruption (see the BytesAvailable method). Therefore this test makes
no sense there.

lldb/unittests/Core/CommunicationTest.cpp

@@ -14,6 +14,7 @@
 
 using namespace lldb_private;
 
+#ifndef _WIN32
 TEST(CommunicationTest, SynchronizeWhileClosing) {
   // Set up a communication object reading from a pipe.
   Pipe pipe;
@@ -33,3 +34,4 @@ TEST(CommunicationTest, SynchronizeWhileClosing) {
 
   ASSERT_TRUE(comm.StopReadThread());
 }
+#endif