[PATCH] ping.c: Add -t TTL support

[Joachim Nilsson]

Hi, maybe someone else is also interested in this.

I was testing multicast routing (pimd) on a server today and needed a
very simple multicast generator.  Calling BusyBox "ping 225.1.2.3" sends
out a neat UDP multicast stream of one packet per second, simple enough
for my purposes.  However, for multicast ICMP_ECHO defaults to a TTL of
1, whereas unicast gets 64.  Hence this little patch.

Regards
 /Joachim

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