[new uImage] Add sha1.o object to mkimage binary build

Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
diff --git a/tools/Makefile b/tools/Makefile
index cbfca6d..0cc4cc9 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -137,7 +137,7 @@
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-$(obj)mkimage$(SFX):	$(obj)mkimage.o $(obj)crc32.o $(obj)image.o
+$(obj)mkimage$(SFX):	$(obj)mkimage.o $(obj)crc32.o $(obj)image.o $(obj)sha1.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@