[sr-dev] RAW socket support for Darwin (OSX)

Hi!

I'm currently having some issues trying to get raw socket support working on OSX. It appears that raw_udp4_send() in raw_sock.c does not compile because OSX support neither IP_PKTINFO nor IP_SENDSRCADDR. However, it seems that raw_udp4_send is not used anywhere, and everything now works over raw_iphdr_udp4_send(), for which only IP_HDRINCL is needed, which is well supported on OSX.

Is that correct that rwa_udp4_send is not used anymore? Could I just remove it /comment it out?

Best regards Raphael.