Patch: correct configure check for netfilter_ipv4 support on some platforms.

[coderman]

on some systems the transparent proxy support is not enabled because
of a failed check for netfilter_ipv4.h.  this check fails because the
ipv4 include expects some of the structure definitions in
netfilter/in.h which is not included in the check.

this patch includes in.h if present to fix the configure check.

best regards,
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