XXX Rearchitect and replace interrupt distribution

*** 192,201 ****
--- 192,202 ----
                  rusagesys.o     \
                  gid.o           \
                  groups.o        \
                  grow.o          \
                  hat_refmod.o    \
+                 interrupt_balancer.o    \
                  id32.o          \
                  id_space.o      \
                  inet_ntop.o     \
                  instance.o      \
                  ioctl.o         \