[Toybox] [PATCH] ping: add -m, switch to xsetsockopt.

[enh]

Bug: http://b/28027677 toybox ping doesn't support -m mark
Test: strace -e setsockopt ./toybox ping -c 1 -m 0x1000 127.0.0.1
---
 toys/net/ping.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)
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