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Another GNU-style inline case.

nfnl_catch() can return stop in certain transient error conditions

ULOG is no longer present in kernels we use. The compat library
is deficient and does not support e.g. mapping of interface names
or timestamps. This patch updates the code to use nflog natively
and removes the ifindex to name mappings using syscalls so this
improves performance too.

Needs to be done before spwaning threads or musl's setregid will
fail if in chroot().

for musl build. the changes are automatically done based on previous
build log errors, so this does not guarantee successful build, but
is a required.

Netfilter-based tool that collect network traffic