Use macros for V8 items

Examples/test-suite/typemap_variables.i

@@ -16,7 +16,7 @@
 // For Javascript V8 we can not use '0' for out typemaps
 #if defined(SWIG_JAVASCRIPT_V8)
 %header %{
-#define OUT_NULL_VALUE v8::Null()
+#define OUT_NULL_VALUE SWIGV8_NULL()
 %}
 #else
 %header %{

Lib/javascript/v8/javascriptprimtypes.swg

@@ -9,7 +9,7 @@ SWIGINTERNINLINE
 v8::Handle<v8::Value>
 SWIG_From_dec(bool)(bool value)
 {
-  return v8::Boolean::New(value);
+  return SWIGV8_BOOLEAN_NEW(value);
 }
 }