Remove (another) now redundant and now conflicting declaration of sysarch(2).  Remove now unnecessary casts.
Remove (another) now redundant and now conflicting declaration of
sysarch(2).  Remove now unnecessary casts.

grep(1) says this is the last sysarch declaration in the src tree.

Reported by:	alpha tinderbox

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