Make message manager dispatch public

Signed-off-by: falkTX <falktx@falktx.com>

modules/juce_events/messages/juce_MessageManager.h

@@ -311,6 +311,7 @@ public:
     // Internal methods - do not use!
     void deliverBroadcastMessage (const String&);
     ~MessageManager() noexcept;
+    static bool dispatchNextMessageOnSystemQueue (bool returnIfNoPendingMessages);
    #endif
 
 private:
@@ -333,7 +334,6 @@ private:
     static void* exitModalLoopCallback (void*);
     static void doPlatformSpecificInitialisation();
     static void doPlatformSpecificShutdown();
-    static bool dispatchNextMessageOnSystemQueue (bool returnIfNoPendingMessages);
 
     JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MessageManager)
 };