revert last change in pc_system.cc
revert last change in pc_system.cc

dbrashear/bochs,dariaphoebe/bochs,dbrashear/bochs,dbrashear/bochs,dbrashear/bochs,dbrashear/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dariaphoebe/bochs,dariaphoebe/bochs