Interesting task: makewhatis repeatability

I just found out that makewhatis does not produce the same output
after two different installworld runs.

I'm not sure why this is, but it would be neat if we could fix it.

To reproduce, try something like:

	make buildworld
	for i in 1 2
	do
		rm -rf /foo/bar
		make installworld DESTDIR=/foo/bar
		md5 /foo/bar/usr/share/man/whatis
	done

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