reciprocal_div: objects with exported symbols should be obj-y rather than lib-y

lib-y := ctype.o string.o vsprintf.o cmdline.o \

	 rbtree.o radix-tree.o dump_stack.o timerqueue.o\

	 idr.o int_sqrt.o extable.o \

	 sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \

	 sha1.o md5.o irq_regs.o argv_split.o \

	 proportions.o flex_proportions.o ratelimit.o show_mem.o \

	 is_single_threaded.o plist.o decompress.o kobject_uevent.o \

	 earlycpio.o

	 bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \

	 gcd.o lcm.o list_sort.o uuid.o flex_array.o iovec.o clz_ctz.o \

	 bsearch.o find_last_bit.o find_next_bit.o llist.o memweight.o kfifo.o \

	 percpu-refcount.o percpu_ida.o hash.o rhashtable.o

	 percpu-refcount.o percpu_ida.o hash.o rhashtable.o reciprocal_div.o

obj-y += string_helpers.o

obj-$(CONFIG_TEST_STRING_HELPERS) += test-string_helpers.o

obj-y += kstrtox.o