Dolphin Git 4.0-540

Dolphin Git 4.0-540 is compiled. This is the trunk of Dolphin Project. Dolphin is the first Gamecube emulator able to run commercial games! Dolphin is a Gamecube, Wii and Triforce (the arcade machine based on the Gamecube) emulator which supports many extra features and abilities not present on the original consoles. It has a partial Wii support and plays most Gamecube games.

Dolphin Git changelog:
* Fix the ZLib in Externals. The CMakeLists file looked like it was copy-pasted from ZLib itself. It didn't work for various reasons.
* Merge branch 'revert-avx'
* Add a non-tiny warning about CPUs that will silently desync.