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Add test validating that libbpf correctly poisons and reports __weak
unresolved kfuncs in post-processed verifier log.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20230418002148.3255690-5-andrii@kernel.org

Signed-off-by: Alexei Starovoitov <ast@kernel.org>