x86_64: prepare shared lib/copy_user.S

lib-y := csum-partial_64.o csum-copy_64.o csum-wrappers_64.o delay_64.o \

	usercopy_64.o getuser_64.o putuser_64.o  \

	thunk_64.o clear_page_64.o copy_page_64.o bitstr_64.o bitops_64.o

lib-y += memcpy_64.o memmove_64.o memset_64.o copy_user.o rwlock_64.o copy_user_nocache_64.o

lib-y += memcpy_64.o memmove_64.o memset_64.o copy_user_64.o rwlock_64.o copy_user_nocache_64.o