fts: pacify GCC 13 -Wuse-after-free Problem reported by Peter Frazier in: https://lists.gnu.org/r/bug-gnulib/2023-02/msg00000.html * lib/fts.c: Include stdint.h. (fts_build): Do not access freed pointer directly; instead, save its bit-pattern into a uintptr_t, and use that to compare. (ADJUST): Likewise, but more trickily since this hack puns pointer types and relies on undefined behavior. * modules/fts (Depends-on): Add stdint.