Attempt to fix warning from MSVC

include/chaiscript/utility/json.hpp

@@ -19,6 +19,7 @@
 #include <initializer_list>
 #include <ostream>
 #include <iostream>
+#include "../chaiscript_defines.hpp"
 
 namespace json {
 
@@ -48,6 +49,21 @@ namespace {
             }
         return output;
     }
+
+    bool isspace(const char c)
+    {
+#ifdef CHAISCRIPT_MSVC
+      // MSVC warns on these line in some circumstances
+#pragma warning(push)
+#pragma warning(disable : 6330)
+#endif
+      return ::isspace(c) != 0;
+#ifdef CHAISCRIPT_MSVC
+#pragma warning(pop)
+#endif
+
+
+    }
 }
 
 class JSON