<machine/spl.h> -> <machine/ipl.h> s/intrmask/intrmask_t/g
<machine/spl.h> -> <machine/ipl.h>
s/intrmask/intrmask_t/g

Reviewed by: bde, se

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