TCC has two components:
The ELF loader, needed by ML MODULES subsystem
The TCC compiler itself. It's used to compile .c files directly on the camera. Handy for user-contributed scripts.
Make the TCC compiler optional, load it as a module when you need to compile new scripts.
ML autoexec.bin size is reduced, thus allowing modules to work on more cameras (such as 1100D/60D)