The non-reentrant gethostbyXXXX() functions deadlock if called recursively, for
    example if libldap needs to be initialized from within gethostbyXXXX() (which
    actually happens if nss_ldap is used for hostname resolution and earlier
    modules can't resolve the local host name), so use the reentrant versions of
    the functions, even if we're not being compiled for use in libldap_r (patch
    from Jeffery Layton, #179730).