Remove #if 0'd remnants of the old idle page zeroing.

sys/kern/kern_idle.c

@@ -18,10 +18,6 @@
 #include <sys/resourcevar.h>
 #include <sys/smp.h>
 #include <sys/unistd.h>
-#if 0
-#include <vm/vm.h>
-#include <vm/vm_extern.h>
-#endif
 #ifdef KTRACE
 #include <sys/uio.h>
 #include <sys/ktrace.h>
@@ -99,11 +95,6 @@ idle_proc(void *dummy)
 				    " for a process");
 #endif
 
-#if 0
-			if (vm_page_zero_idle() != 0)
-				continue;
-#endif
-
 #ifdef __i386__
 			cpu_idle();
 #endif