do intermediate step in order to omit "dereferencing type-punned pointer" error

Author: Matthias Loy

src/lib_json/json_value.cpp

@@ -34,7 +34,8 @@ namespace Json {
 #define ALIGNAS(byte_alignment)
 #endif
 static const unsigned char ALIGNAS(8) kNull[sizeof(Value)] = {0};
-const Value& Value::null = reinterpret_cast<const Value&>(kNull);
+const unsigned char& kNullRef = kNull[0];
+const Value& Value::null = reinterpret_cast<const Value&>(kNullRef);
 
 const Int Value::minInt = Int(~(UInt(-1) / 2));
 const Int Value::maxInt = Int(UInt(-1) / 2);