upgrade to JUCE 5.4.3. Remove (probably) unused JUCE modules. Remove VST2 target (it's been end-of-life'd by Steinberg and by JUCE)

modules/juce_events/interprocess/juce_InterprocessConnection.h

@@ -197,9 +197,9 @@ private:
     int readData (void*, int);
 
     struct ConnectionThread;
-    friend struct ConnectionThread;
-    friend struct ContainerDeletePolicy<ConnectionThread>;
     std::unique_ptr<ConnectionThread> thread;
+    std::atomic<bool> threadIsRunning { false };
+
     void runThread();
     int writeData (void*, int);