Fixed a build error and warning on 10.6

examples/Demo/Source/Demos/GridDemo.cpp

@@ -27,7 +27,7 @@
 #include "../JuceDemoHeader.h"
 
 // these classes are C++11-only
-#if JUCE_HAS_CONSTEXPR
+#if JUCE_HAS_CONSTEXPR && JUCE_COMPILER_SUPPORTS_INITIALIZER_LISTS
 
 struct GridDemo   : public Component
 {

modules/juce_core/misc/juce_StdFunctionCompat.h

@@ -154,7 +154,7 @@ namespace std
         FunctorHolderBase<Result, Arguments...>* getFunctorStorage (int size)
         {
             return reinterpret_cast<FunctorHolderBase<Result, Arguments...>*>
-                       (size > functorHolderStackSize ? new char [size]
+                       (size > functorHolderStackSize ? new char [static_cast<unsigned long> (size)]
                                                       : &(stackFunctorStorage[0]));
         }