Some functions are used in the tree and are currently marked as
deprecated by upstream. This commit refreshes the code to use the
recommended functions, leading to the following changes:
- xmlSubstituteEntitiesDefault() is gone, and needs to be replaced with
XML_PARSE_NOENT for the paths doing the parsing.
- xmlParseMemory() -> xmlReadMemory().
These functions, as well as more functions setting global states, have
been officially marked as deprecated by upstream in August 2022. Their
replacements exist since the 2001-ish area, as far as I have checked,
so that should be safe.
Author: Dmitry Koval
Discussion: https://postgr.es/m/18274-98d16bc03520665f@postgresql.org
65c5864d7f