By Daniel Kline The fast-food giant rarely tweaks its morning menu, but it’s making two big additions as potentially an answer to a huge Wendy’s move. Why fix something that isn’t broken? McDonald’s (MCD) – Get McDonald’s Corporation Report breakfast menu has always been built around the classic Egg McMuffin. That sandwich, which is roughly 50 years old (it was invented in 1971), was originally meant as a take on Eggs Benedict. That explains the odd choice of Canadian Bacon as the meat for the simple sandwich featuring an egg, a slice of cheese, and the less good kind of bacon that’s actually …