main/fping: Backport fix for ping from unprivileged containers

Merged Nash Kaminski requested to merge gs-kamnas/aports:fping_unpriv_patch into master

This patch backports the upstream fix for a regression introduced as of fping version 5.1 where pinging hosts from an unprivileged container no longer functions.

Specifically, this regression is a result of a logic error in the raw socket -> datagram socket + IPPROTO_ICMP set fallback logic.

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