CRIS v10: Update rescue Kbuild makefile.

- Remove old specific targets, use more generic ones instead.
- Use if_changed to avoid creating new images when no change.
  Removes a lot of cruft.
- Use EXTRA_CFLAGS instead of CFLAGS.

arch/cris/arch-v10/boot/rescue/Makefile

 #
-# Makefile for rescue code
+# Makefile for rescue (bootstrap) code
 #
-target = $(target_rescue_dir)
-src    = $(src_rescue_dir)
 
 CC = gcc-cris -mlinux $(LINUXINCLUDE)
-CFLAGS = -O2
+EXTRA_CFLAGS = -O2
+AFLAGS = -traditional
 LD = gcc-cris -mlinux -nostdlib
+LDFLAGS = -T $(obj)/rescue.ld
 OBJCOPY = objcopy-cris
 OBJCOPYFLAGS = -O binary --remove-section=.bss
+obj-$(CONFIG_ETRAX_AXISFLASHMAP) = head.o
+OBJECT := $(obj)/head.o
 
-all: $(target)/rescue.bin $(target)/testrescue.bin $(target)/kimagerescue.bin
+targets := rescue.o rescue.bin
 
-$(target)/rescue.bin: $(target) $(target)/head.o
-	$(LD) -T $(src)/rescue.ld -o $(target)/rescue.o $(target)/head.o
-	$(OBJCOPY) $(OBJCOPYFLAGS) $(target)/rescue.o $(target)/rescue.bin
-# Place a copy in top-level build directory
-	cp -p $(target)/rescue.bin $(objtree)
+$(obj)/rescue.o: $(OBJECT) FORCE
+	$(call if_changed,ld)
 
-$(target)/testrescue.bin: $(target) $(target)/testrescue.o
-	$(OBJCOPY) $(OBJCOPYFLAGS) $(target)/testrescue.o tr.bin
+$(obj)/rescue.bin: $(obj)/rescue.o FORCE
+	$(call if_changed,objcopy)
+	cp -p $(obj)/rescue.bin $(objtree)
+
+$(obj)/testrescue.bin: $(obj)/testrescue.o
+	$(OBJCOPY) $(OBJCOPYFLAGS) $(obj)/testrescue.o tr.bin
 # Pad it to 784 bytes
 	dd if=/dev/zero of=tmp2423 bs=1 count=784
 	cat tr.bin tmp2423 >testrescue_tmp.bin
-	dd if=testrescue_tmp.bin of=$(target)/testrescue.bin bs=1 count=784
+	dd if=testrescue_tmp.bin of=$(obj)/testrescue.bin bs=1 count=784
 	rm tr.bin tmp2423 testrescue_tmp.bin
 
-$(target)/kimagerescue.bin: $(target) $(target)/kimagerescue.o
-	$(OBJCOPY) $(OBJCOPYFLAGS) $(target)/kimagerescue.o ktr.bin
+$(obj)/kimagerescue.bin: $(obj)/kimagerescue.o
+	$(OBJCOPY) $(OBJCOPYFLAGS) $(obj)/kimagerescue.o ktr.bin
 # Pad it to 784 bytes, that's what the rescue loader expects
 	dd if=/dev/zero of=tmp2423 bs=1 count=784
 	cat ktr.bin tmp2423 >kimagerescue_tmp.bin
-	dd if=kimagerescue_tmp.bin of=$(target)/kimagerescue.bin bs=1 count=784
+	dd if=kimagerescue_tmp.bin of=$(obj)/kimagerescue.bin bs=1 count=784
 	rm ktr.bin tmp2423 kimagerescue_tmp.bin
-
-$(target):
-	mkdir -p $(target)
-
-$(target)/head.o: $(src)/head.S
-	$(CC) -D__ASSEMBLY__ -traditional -c $< -o $*.o
-
-$(target)/testrescue.o: $(src)/testrescue.S
-	$(CC) -D__ASSEMBLY__ -traditional -c $< -o $*.o
-
-$(target)/kimagerescue.o: $(src)/kimagerescue.S
-	$(CC) -D__ASSEMBLY__ -traditional -c $< -o $*.o
-
-clean:
-	rm -f $(target)/*.o $(target)/*.bin
-
-fastdep:
-
-modules:
-
-modules-install: