small bugfix for std.socket; use reentrant gethostbyname

[Downs]

Downs schrieb:
> 483,485c485,489
> <         hostent* he = gethostbyname(toStringz(name));
> <         if(!he)
> <             return false;
> ---
>  >         hostent he_buf;
>  >         char[4096] buffer; int error;
>  >         hostent *he;
>  >         if (gethostbyname_r(toStringz(name), &he_dump, buffer.ptr, 
> buffer.length, &he, &error)!=0) return false;
> 
> Also, the old way would cause a problem .. because as the manpage for
> gethostbyname will verify, if he != 0 doesn't mean there's no error ..
> that's what h_errno is for. A return value of 0 from gethostbyname_r,
> however, does guarantee there's no error.
> (The problem with the return value would cause an error later on,
>  where populate had to work with an invalid struct - that's how I
>  found it in the first place)
> 
> Greetings --downs
Hold on a sec, it looks like mingw has no reentrant gethostbyname_r ... argh x_x