Fixed build for older OSX SDKs.

modules/juce_gui_basics/native/juce_mac_MainMenu.mm

@@ -296,7 +296,12 @@ private:
         NSMenu* m = [[NSMenu alloc] initWithTitle: juceStringToNS (menuName)];
 
         [m setAutoenablesItems: false];
+
+       #if defined (MAC_OS_X_VERSION_10_6) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
         [m setDelegate: (id<NSMenuDelegate>) callback];
+       #else
+        [m setDelegate: callback];
+       #endif
 
         for (PopupMenu::MenuItemIterator iter (menu); iter.next();)
             addMenuItem (iter, m, topLevelMenuId, topLevelIndex);

modules/juce_gui_basics/native/juce_mac_NSViewComponentPeer.mm

@@ -106,7 +106,11 @@ public:
 
             setOwner (window, this);
             [window orderOut: nil];
+           #if defined (MAC_OS_X_VERSION_10_6) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
             [window setDelegate: (id<NSWindowDelegate>) window];
+           #else
+            [window setDelegate: window];
+           #endif
             [window setOpaque: component->isOpaque()];
             [window setHasShadow: ((windowStyleFlags & windowHasDropShadow) != 0)];