But there is absolutely no reason to use triple buffering on this emulator, as it never struggles to push 60 frames per second.
With triple buffering, the delay between the moment you render the frame and the moment it is shown is increased by a few milliseconds, so if you don't need it, better stay with double buffering.
Also, patching the toolchain does not change the fact that triple-buffering will work only with the new firmware (it reverts to double-buffering on older firmwares).