buildworld broken in sched_ule

[Pawel Worach]

/usr/src/sys/kern/sched_ule.c: In function `sched_clock':
/usr/src/sys/kern/sched_ule.c:904: `TD_IDLETD' undeclared (first use in this
function)
/usr/src/sys/kern/sched_ule.c:904: (Each undeclared identifier is reported
only once
/usr/src/sys/kern/sched_ule.c:904: for each function it appears in.)

guess this should be:
-        if (td->td_flags & TD_IDLETD)
+        if (td->td_flags & TDF_IDLETD)