dev: handle upcoming libxml2's use of const for xmlError pointers #3014
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What problem is this PR intended to solve?
upcoming libxml 2.12.0 will use
const xmlError *
as the data type for many function signatures where it'sxmlErrorPtr
today.let's update our code to use the new convention.
see https://gitlab.gnome.org/GNOME/libxml2/-/commit/45470611b047db78106dcb2fdbd4164163c15ab7 and other upstream commits