338e6102a6
Adds the TCPOPT_* constants from NetBSD. Note that the BSDs also have TCPOPT_SIGNATURE, but Linux calls that TCPOPT_MD5SIG and glibc doesn't have any corresponding constant yet, so let's wait until we see which name wins out. Change-Id: If53cdada5595285d9a7e7248ef74cd7502d804c0