Add the neccessary sockopts for ping and traceroute on IPv6.

This fixes the following qemu warnings with IPv6:
Unsupported ancillary data: 0/2
Unsupported ancillary data: 0/11
Unsupported ancillary data: 41/25
Unsupported setsockopt level=0 optname=12
Unsupported setsockopt level=41 optname=16
Unsupported setsockopt level=41 optname=25
Unsupported setsockopt level=41 optname=50
Unsupported setsockopt level=41 optname=51
Unsupported setsockopt level=41 optname=8
Unsupported setsockopt level=58 optname=1

Tested with hppa-linux-user (big-endian) on x86_64 (little-endian).
Signed-off-by: NHelge Deller <deller@gmx.de>
Reviewed-by: NLaurent Vivier <laurent@vivier.eu>
Tested-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170218223130.GA25278@ls3530.fritz.box>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>