Use the socket option constants defined in the golang.org/x/sys/unix
package instead of duplicating them in this package.
Note that for now, sysIP_RECVDSTADDR, sysIP_RECVIF, sysIP_RECVTTL and
sysIP_PKTINFO still need to be defined because they are used in code
shared with other platforms.
Change-Id: I9bb953dc72dea19e9e9d84dc641346fe95bad070
Reviewed-on: https://go-review.googlesource.com/c/net/+/303909
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
2c4c8ecb78