[3.8] gh-117187: Fix XML tests for vanilla Expat <2.6.0 (GH-117203) #117248
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This fixes XML unittest fallout from the #115398 security fix. When configured using
--with-system-expat
on systems with older pre 2.6.0 versions of libexpat, our unittests were failing.Idea by Matěj Cepl
This does not fix the case of distros with an older version of libexpat with the 2.6.0 feature backported as a security fix. (Ubuntu is a known example of this with its libexpat1 2.5.0-2ubunutu0.1 package)
(cherry picked from commit 9f74e86)
Co-authored-by: Sebastian Pipping [email protected]