libbpf is meant to work with the bpf that kernel provides. In focal,
newer versions of bpf toolchain are provided, because llvm is regularly
backported. In focal, libbpf used to be vendored inside dwarves-dfsg and
it is desired as a new package to i.e. build linux bpf tools, and
because focal receives hwe kernel backports from impish.

From kernel point of view, I don't need new libbpf in hirsute, because
hirsute does not receive hwe kernels.

Can I update libbpf in focal, without having it in hirsute?

Would it help to vendor newer libbpf inside src:dwarves-dfsg for the SRU
purposes, as it shipped in focal? Such that libbpf newer than hirsute
does not appear in focal?

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https://bugs.launchpad.net/bugs/1912811

Title:
  Update dwarves-dfsg in focal to version 1.21 from hirsute

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