Add support for MACHINE=pc98. This leaves a single legacy entry for the old aout bootloader.
Add support for MACHINE=pc98. This leaves a single legacy entry for
the old aout bootloader.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase