fix macOS build (following Projucer changes made in Windows, which removed /Applications/JUCE/modules from its headers). move JUCE headers under source control, so that Windows and macOS can both build against same version of JUCE. remove AUv3 target (I think it's an iOS thing, so it will never work with this macOS fluidsynth dylib).

modules/juce_events/messages/juce_DeletedAtShutdown.cpp

@@ -0,0 +1,94 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   The code included in this file is provided under the terms of the ISC license
+   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
+   To use, copy, modify, and/or distribute this software for any purpose with or
+   without fee is hereby granted provided that the above copyright notice and
+   this permission notice appear in all copies.
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+static SpinLock deletedAtShutdownLock; // use a spin lock because it can be statically initialised
+
+static Array<DeletedAtShutdown*>& getDeletedAtShutdownObjects()
+{
+    static Array<DeletedAtShutdown*> objects;
+    return objects;
+}
+
+DeletedAtShutdown::DeletedAtShutdown()
+{
+    const SpinLock::ScopedLockType sl (deletedAtShutdownLock);
+    getDeletedAtShutdownObjects().add (this);
+}
+
+DeletedAtShutdown::~DeletedAtShutdown()
+{
+    const SpinLock::ScopedLockType sl (deletedAtShutdownLock);
+    getDeletedAtShutdownObjects().removeFirstMatchingValue (this);
+}
+
+#if JUCE_MSVC
+ // Disable unreachable code warning, in case the compiler manages to figure out that
+ // you have no classes of DeletedAtShutdown that could throw an exception in their destructor.
+ #pragma warning (push)
+ #pragma warning (disable: 4702)
+#endif
+
+void DeletedAtShutdown::deleteAll()
+{
+    // make a local copy of the array, so it can't get into a loop if something
+    // creates another DeletedAtShutdown object during its destructor.
+    Array<DeletedAtShutdown*> localCopy;
+
+    {
+        const SpinLock::ScopedLockType sl (deletedAtShutdownLock);
+        localCopy = getDeletedAtShutdownObjects();
+    }
+
+    for (int i = localCopy.size(); --i >= 0;)
+    {
+        JUCE_TRY
+        {
+            auto* deletee = localCopy.getUnchecked(i);
+
+            // double-check that it's not already been deleted during another object's destructor.
+            {
+                const SpinLock::ScopedLockType sl (deletedAtShutdownLock);
+
+                if (! getDeletedAtShutdownObjects().contains (deletee))
+                    deletee = nullptr;
+            }
+
+            delete deletee;
+        }
+        JUCE_CATCH_EXCEPTION
+    }
+
+    // if this fails, then it's likely that some new DeletedAtShutdown objects were
+    // created while executing the destructors of the other ones.
+    jassert (getDeletedAtShutdownObjects().isEmpty());
+
+    getDeletedAtShutdownObjects().clear(); // just to make sure the array doesn't have any memory still allocated
+}
+
+#if JUCE_MSVC
+ #pragma warning (pop)
+#endif
+
+} // namespace juce