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@pieterlexis review welcome, there might be a prettier way to check this I don't know about!
I think AC_CHECK_DECL is meant to check for functions. Or evben better, use AC_CHECK_FUNC
dnsdist: Disable eBPF support when BPF_FUNC_tail_call is not found
Rewritten with AC_CHECK_DECL, as AC_CHECK_FUNC does not work for BPF_FUNC_tail_call since it's not a function. Thank you!