Avoided some warnings in the AU wrapper.

modules/juce_audio_plugin_client/AU/juce_AU_Wrapper.mm

@@ -36,7 +36,12 @@
  #define JUCE_SUPPORT_CARBON 0
 #endif
 
-#include "../utility/juce_IncludeSystemHeaders.h"
+#ifdef __clang__
+ #pragma clang diagnostic push
+ #pragma clang diagnostic ignored "-Wshorten-64-to-32"
+#endif
+
+include "../utility/juce_IncludeSystemHeaders.h"
 
 #include <AudioUnit/AUCocoaUIView.h>
 #include <AudioUnit/AudioUnit.h>
@@ -71,6 +76,10 @@
  class JuceAUView;
 #endif
 
+#ifdef __clang__
+ #pragma clang diagnostic pop
+#endif
+
 #define JUCE_MAC_WINDOW_VISIBITY_BODGE 1
 
 #include "../utility/juce_IncludeModuleHeaders.h"