couple of small mac fixes

build/macosx/platform_specific_code/juce_mac_Files.mm

@@ -231,6 +231,8 @@ bool File::isHidden() const throw()
 //==============================================================================
 const File File::getSpecialLocation (const SpecialLocationType type)
 {
+    const ScopedAutoReleasePool pool;
+
     const char* resultPath = 0;
 
     switch (type)

build/macosx/platform_specific_code/juce_mac_MainMenu.mm

@@ -431,6 +431,9 @@ void MenuBarModel::setMacMainMenu (MenuBarModel* newMenuBarModel,
     }
 
     rebuildMainMenu (extraAppleMenuItems);
+
+    if (newMenuBarModel != 0)
+        newMenuBarModel->menuItemsChanged();
 }
 
 MenuBarModel* MenuBarModel::getMacMainMenu() throw()

juce_amalgamated.cpp

@@ -264065,6 +264065,8 @@ bool File::isHidden() const throw()
 
 const File File::getSpecialLocation (const SpecialLocationType type)
 {
+    const ScopedAutoReleasePool pool;
+
     const char* resultPath = 0;
 
     switch (type)
@@ -267167,6 +267169,9 @@ void MenuBarModel::setMacMainMenu (MenuBarModel* newMenuBarModel,
     }
 
     rebuildMainMenu (extraAppleMenuItems);
+
+    if (newMenuBarModel != 0)
+        newMenuBarModel->menuItemsChanged();
 }
 
 MenuBarModel* MenuBarModel::getMacMainMenu() throw()