DIRCACHE_MIN_MEM_MB does not stringify on FreeBSD, we should use %d instead
A FreeBSD relay operator reports the message:
[WARN] Being a directory cache (default) with less than DIRCACHE_MIN_MB_BANDWIDTH MB of memory is not recommended and may consume most of the available resources, consider disabling this functionality by setting the DirCache option to 0So we should print the macro value the same way we do every other value, using "%d" in the string, and passing it as an argument.
(This macro changed name in #20684 (moved).)
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