Replaced flagalrm() timers with another technique to check for timeouts.

This allowed removing the p_flagarlm timer from the kernel's process table.
Furthermore, I merged p_syncalrm and p_signalrm into p_alarm_timer to save
even more space. Note that processes can no longer have both a signal and
synchronous alarm timer outstanding as of now.

lib/utils/Makefile

@@ -8,6 +8,7 @@ all:	$(LIBUTILS)
 
 OBJECTS	= \
 	$(LIBUTILS)(tick_delay.o) \
+	$(LIBUTILS)(get_upt.o) \
 	$(LIBUTILS)(get_mon_prm.o) \
 	$(LIBUTILS)(env_parse.o) \
 	$(LIBUTILS)(env_panic.o) \
@@ -24,6 +25,9 @@ $(LIBUTILS):	$(OBJECTS)
 	aal cr $@ *.o
 	rm *.o
 
+$(LIBUTILS)(get_upt.o):	get_upt.c
+	$(CC1) get_upt.c
+
 $(LIBUTILS)(tick_delay.o):	tick_delay.c
 	$(CC1) tick_delay.c