x86_64: prepare shared lib/csum-copy.S

obj-y := io.o iomap_copy_64.o

obj-$(CONFIG_SMP)	+= msr-on-cpu.o

lib-y := csum-partial.o csum-copy.o csum-wrappers.o delay.o \

lib-y := csum-partial.o csum-copy_64.o csum-wrappers.o delay.o \

	usercopy.o getuser.o putuser.o  \

	thunk_64.o clear_page.o copy_page_64.o bitstr_64.o bitops.o

lib-y += memcpy.o memmove.o memset.o copy_user.o rwlock.o copy_user_nocache.o