* inet/Makefile (routines): Add getipnodebyad and freehostent.
* inet/Versions [GLIBC_2.2] (libc): Add getipnodebyad and freehostent.
* inet/freehostent.c: New file.
* inet/getipnodebyad.c: New file.
* nss/digits_dots.c: Fail if IPv6 is found and IPv4 is requested.
Add support for getipnode* functions.
* nss/digits_dots.c: Don't use __set_h_errno, assign to *h_errnop.
Set h_aliases to NULL and not to a pointer to an array with a NULL
pointer following XNS 5.2.
