Add 'getidle' CPU utilization measurement infrastructure

kernel/arch/i386/exception.c

@@ -8,7 +8,6 @@
 #include <signal.h>
 #include <stdio.h>
 #include <string.h>
-#include <minix/sysutil.h>
 #include "../../proc.h"
 #include "../../proto.h"
 #include "../../vm.h"

kernel/arch/i386/memory.c

@@ -6,7 +6,6 @@
 
 #include <minix/type.h>
 #include <minix/syslib.h>
-#include <minix/sysutil.h>
 #include <minix/cpufeature.h>
 #include <string.h>
 

kernel/arch/i386/proto.h

@@ -119,7 +119,6 @@ struct tss_s {
 
 EXTERN struct tss_s tss;
 
-_PROTOTYPE( void prot_init, (void)                     			);
 _PROTOTYPE( void idt_init, (void)                     			);
 _PROTOTYPE( void init_codeseg, (struct segdesc_s *segdp, phys_bytes base,
                 vir_bytes size, int privilege)                          );

kernel/arch/i386/system.c

@@ -9,7 +9,6 @@
 #include <ibm/bios.h>
 #include <minix/portio.h>
 #include <minix/u64.h>
-#include <minix/sysutil.h>
 #include <a.out.h>
 
 #include "proto.h"