Debug objects for resolving dependencies

Requires `nm` on your local system

Run `finddeps.sh coleco.o` or with whatever system.o file to get a list of files you need to include in the makefile

These were built with a 64-bit build of MESS 0.142u6 with DEBUG=1 and SYMBOLS=1, based on the "Building old MESS" doc.
Updated dependency-searching scripts
finddeps.sh is obsoleted