Ruby: missing Directory Reference

Ruby 3.2.5p208 (2024-07-26 revision 31d0f1a2e7dbfb60731d1f05b868e1d578cda493)

missing Directory Reference

## Files
| acosh.c
| alloca.c
| cbrt.c
| close.c
| crt_externs.h
| crypt.c
| crypt.h
| des_tables.c
| dtoa.c
| erf.c
| explicit_bzero.c
| ffs.c
| file.h
| flock.c
| hypot.c
| langinfo.c
| lgamma_r.c
| memcmp.c
| memmove.c
| mt19937.c
| nan.c
| nextafter.c
| procstat_vm.c
| setproctitle.c
| strchr.c
| strerror.c
| strlcat.c
| strlcpy.c
| strstr.c
| tgamma.c