This change is rather unpleasant as it changes a public struct,
therefore it is a API and ABI-breaking. It affects the igraph project,
which no longer compiles.

We used a test on `LIBXML_VERSION` to determine what to expect in the
`xmlEntity` struct. However, Ubuntu now has a different struct layout in
libxml2 version 2.9 than what the standard 2.9 release has. I do not see
a robust way to test for which struct layout we have.

If I missed something, please let me know.

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https://bugs.launchpad.net/bugs/2141260

Title:
  libxml2 - CVE-2026-6653 - use after free in patch for CVE-2021-3541

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