Remove subr_diskslice.c and subr_diskmbr.c which I can see no traces off a need for in the x86_64 files.  Not compile tested.
Remove subr_diskslice.c and subr_diskmbr.c which I can see no traces off
a need for in the x86_64 files.  Not compile tested.

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