libxml2 v2.10.0 deprecated functions

libxml2 v2.10.0 (release date Aug 17 2022) has deprecated some functions that BIND is currently using. See https://github.com/GNOME/libxml2/blob/master/NEWS.

main.c:1366:9: error: `xmlInitThreads` is deprecated
main.c:1487:9: error: `xmlCleanupThreads` is deprecated

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