Define _HAVE_SA_LEN for 4.4 BSD

[Ulrich Drepper]

Mark Kettenis <kettenis@wins.uva.nl> writes:

> For 4.4 BSD we obviously need to define _HAVE_SA_LEN.  This fixes a
> compilation problem for the Hurd since we use the 4.4 BSD `struct
> sockaddr_*'.

Applied.  But I thought Hurd uses the Linux networking code!?

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