Left 4 Dead 2 - Update

[steam_news]

- Fixed the game and tools not launching on machines with 16+ CPUs.
- Fixed missing and incorrect music being played in the L4D1 campaigns
- Swamp Fever - The Swamp: Added additional self-terminating survivor-only blockers to the areas above the airplane wreckage to prevent players from skipping the airplane event. These blockers are killed once the airplane door is opened.
- Cold Stream South Pine Stream: Added a small blocker next to a crate near the military truck near mid-level to resolve a minor stuck spot.
- Fixed controller navigation in mutation menus

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