Move NODEVFS and NO_GEOM to opt_global.h.
Move NODEVFS and NO_GEOM to opt_global.h.

This allows me to mark code which they control with #ifdef without
polluting files with #includes of opt_devfs.h and opt_geom.h.

Once these two options are removed, this will allow mechanical removal
of the bits their removal makes obsolete.

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