S3C24x0: extract interrupts from timer

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/cpu/arm920t/s3c24x0/Makefile b/cpu/arm920t/s3c24x0/Makefile
index 5d2be2c..7e8d6ed 100644
--- a/cpu/arm920t/s3c24x0/Makefile
+++ b/cpu/arm920t/s3c24x0/Makefile
@@ -25,13 +25,15 @@
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	+= speed.o
-COBJS	+= timer.o
-COBJS	+= usb.o
-COBJS	+= usb_ohci.o
+COBJS-$(CONFIG_USE_IRQ) += interrupts.o
+COBJS-y	+= speed.o
+COBJS-y	+= timer.o
+COBJS-y	+= usb.o
+COBJS-y	+= usb_ohci.o
 
-SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+
+SRCS	:= $(SOBJS:.o=.S) $(COBJS-y:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS-y))
 
 all:	$(obj).depend $(LIB)