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Previously when multiple BPF object files referencing the same extern function (usually kfunc) are statically linked using `bpftool gen object`, libbpf tries to get the nonexistent size of BTF_KIND_FUNC_PROTO and fails. This test ensures it is fixed. Signed-off-by: Eric Long <i@hack3r.moe> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20241002-libbpf-dup-extern-funcs-v4-2-560eb460ff90@hack3r.moe