startmake.sh doesn't get all dependencies for jaguar

[DopefishJustin]

I tried to build JSMESS for the 'jaguar' driver and the build fails missing some 386 cpu emulation stuff. The jaguar system proper does not use a 386 but some of the related hardware in MAME does, and unusually, the systems are all packaged together in one driver file, src/mame/drivers/jaguar.c. This should probably be changed on the MAME side but in the meantime it is a deficiency in the script.

I was able to build by adding the following line to the generated jaguar.mak file:

CPUS += I386