NamedPipe: Fix potential vptr data-race in unit tests

modules/juce_core/network/juce_NamedPipe.cpp

@@ -210,11 +210,6 @@ private:
                 pipe.openExisting (pipeName);
         }
 
-        ~NamedPipeThread()
-        {
-            stopThread (100);
-        }
-
         NamedPipe pipe;
         const String& pipeName;
         WaitableEvent& workCompleted;
@@ -231,6 +226,11 @@ private:
               sendData (sData)
         {}
 
+        ~SenderThread() override
+        {
+            stopThread (100);
+        }
+
         void run() override
         {
             result = pipe.write (&sendData, sizeof (sendData), 2000);
@@ -248,6 +248,11 @@ private:
             : NamedPipeThread ("NamePipeSender", pName, shouldCreatePipe, completed)
         {}
 
+        ~ReceiverThread() override
+        {
+            stopThread (100);
+        }
+
         void run() override
         {
             result = pipe.read (&recvData, sizeof (recvData), 2000);