Add P_ITHREAD to the string formatting bits.

Author: haesbaert

sys/sys/proc.h

@@ -384,7 +384,7 @@ struct proc {
      "\010SINTR\012SYSTEM" \
      "\013TIMEOUT\016WEXIT\020OWEUPC\024SUSPSINGLE" \
      "\027SYSTRACE\030CONTINUED\033THREAD" \
-     "\034SUSPSIG\035SOFTDEP\037CPUPEG")
+     "\034SUSPSIG\035SOFTDEP\036ITHREAD\037CPUPEG")
 
 #define	THREAD_PID_OFFSET	1000000