ws2_32: Fix allocating a hostent with no h_aliases list. (try 2)

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    The attached patch fixes Bug #20995, which was introduced by
commit 355818ae1e1222bffab7d014a952e4f70e3623d0.  When an application
requests the local IP addresses using gethostbyname() the returned
hostent has an empty h_aliases list.  Without this patch applications
will crash if they examine the h_aliases list without first ensuring
that h_aliases is non-NULL.  This version differs from the last in
that it does not include a check on the validity of the internally
generated "list length" parameters and instead provides additional
documentation on the proper calling procedure.
Changelog:
    ws2_32: Fix allocating a hostent with no h_aliases list.
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