Make ping6 compile.

With these changes, ping6 compiles and runs in the normal raw
socket mode which requires root privileges.

(cherry-pick of d06ff8674fa66847aadb1c96602e8cdb7450a655.)

Bug: 9469682
Change-Id: Iee62f73c94e403e6f52ce0aeff583ee3952fb717
5 files changed