Discovered that although gcc is putting the .debug_gdb_scripts into foo.sym.o, the loader is somehow stripping it
out when the executable foo is created.  Consequently, I have changed cobcd to place foo-gdb.py next to the
foo executable.  Will investigate to see if a nicer solution is possible.

Also found that the SFIX logic that puts a .loc directive at every function's entry point was looking for
the text "@function" in Intel and Arm assembler.  The SPARC assembly code has "#function" at the equivalent
point.

Also need to handle problems caused by SPARC being a big-endian machine.  This is the first I've seen that.