small bugfix for std.socket; use reentrant gethostbyname

[Downs]

<snip some false information>

Looks like I have to apologize. From the manpage:

 >       The  gethostbyname()  and  gethostbyaddr() functions return the hostent
 >       structure or a NULL pointer if an error occurs.  On error, the  h_errno


But that is extremely odd, since I have a verified case
where gethostbyname would return a struct with an
_invalid_ h_aliases entry. Confusing.
Perhaps a threading issue? Should gethostbyname usage
be synchronized? I'll look into that.
                apologetic --downs