libxml 2.11.0 breaks ABI by default

upstream report: https://gitlab.gnome.org/GNOME/libxml2/-/issues/526

this might be a similar issue as:
https://gitlab.gnome.org/GNOME/libxml2/-/issues/433

the likely cause, however, is symbol visibility. from the changelog:

 This release finally fixes symbol visibility on UNIX systems. Internal symbols
 will now be hidden. While these symbols were never declared in public  headers,
 it was still possible to declare them manually. Now this won't work.

 All symbol information has been removed from the ELF version script to fix
 link errors with --no-undefined-version. The version nodes are kept so it
 should still be possible to run binaries linked against older versions.

distributors should most likely rebuild everything against this version,
or find a way to toggle to the old version, to ensure ABI compatibility.