We now depend on explicitly creating memory arenas and disabling tcache on those, and these features are not available with jemalloc < 4. Instead of working around these issues, make the jemalloc >= 4.0.0 hard requirement by looking for sdallocx() symbol that's only available from that version. The jemalloc < 4 was only used by RHEL 7 which is not supported since BIND 9.19+.
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38 KiB