[PATCH,HURD] comment out PF_LINK/AF_LINK

[Pino Toscano]

Hi,

Hurd's bits/socket.h currently define PF_LINK & AF_LINK. Although, they 
are usually associated with sockaddr_dl sockets, which are not 
implemented on Hurd, causing few build failures because of the 
assumption that having AF_LINK defined means there are sockaddr_dl 
available.
The attached patch comments them out (instead of removing them, to keep 
their placeholders).

Thanks,
-- 
Pino Toscano

hurd_AF_LINK.diff
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