Add patch from Per Hedeland

 Per H @ Tail-f: The original code here had problems that possibly
   only occur if you abuse it for non-INET sockets, but anyway:
   a) If the getsockopt for SO_PRIORITY or IP_TOS failed, the actual
      requested setsockopt was never even attempted.
   b) If {get,set}sockopt for one of IP_TOS and SO_PRIORITY failed,
      but ditto for the other worked and that was actually the requested
      option, failure was still reported to erlang.

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