Arducopter 2.3 and Arducopter 2.5.5 with NO CLI
The 2.5.5 firmware also has a few other modules removed as per this thread on DIY Drones.
Please be aware I've not tested the 2.5.5 version (yet) but the 2.3 release seems to fly perfectly well but again I've not tested the flight modes.
# define GPS_PROTOCOL GPS_PROTOCOL_MTK16
# define CONFIG_RELAY DISABLED
# define CAMERA DISABLED
# define MOUNT DISABLED
# define CLI_ENABLED DISABLED
The other files I've used to compile with and from are here:
Arduino 0022 (Relax Patch)
Arducopter firmware sources