iso9660: fix build after linux package change

linux26 target is no more.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/iso9660/iso9660.mk

@@ -15,7 +15,7 @@ ifeq ($(BR2_TARGET_ROOTFS_ISO9660_SQUASH),y)
 ISO9660_OPTS+=-U
 endif
 
-$(BINARIES_DIR)/rootfs.iso9660: host-cdrkit host-fakeroot linux26 rootfs-ext2 grub
+$(BINARIES_DIR)/rootfs.iso9660: host-cdrkit host-fakeroot linux rootfs-ext2 grub
 	@$(call MESSAGE,"Generating root filesystem image rootfs.iso9660")
 	mkdir -p $(ISO9660_TARGET_DIR)
 	mkdir -p $(ISO9660_TARGET_DIR)/boot/grub