sync to fts.c 1.49, fts.h 1.19
Update from NetBSD src/lib/libc/gen/fts.c 1.38 to 1.49.
Update from NetBSD src/include/fts.h 1.18 to 1.19.
Notable changes:
- Minimize changes from upstream NetBSD methods.
- Bump fts_level from short to int to avoid a potential DoS.
- Make sure fts_statp is NULL when FTS_NOSTAT is set.
- Use [non-standard] O_CLOEXEC instead of fcntl(FD_CLOEXEC).
- Avoid potential integer overflow.
- Fix double free in fts_read()/fts_close().
- Use calloc(1, ...) instead of malloc(...) & memset.
UnifiedSplitRaw
