* lib/realloc.c: Include <stdckdint.h>, not "xalloc-oversized.h".
Use of xalloc_oversized replaced by ckd_add.
(rpl_realloc) [!NEED_SANITIZED_REALLOC]:
Treat realloc (p, 0) as if it were a realloc (p, 1) that never fails.
That’s easier, reduces module dependencies,
and better supports the future alloc-0-nonnull module.
* modules/realloc-posix (Depends-on): Remove free-posix,
malloc-posix, xalloc-oversized. Add stdckdint.