Removed unused headers from schedule.c
#include <kernel.h>
#include <apic.h>
-// XXX these three should go away along with thread_pause below
-#include <pagecache.h>
-#include <tfs.h>
-#include <unix.h>
-
/* Try to keep these within the confines of the runloop lock so we
don't create too much of a mess. */
