--compare-dest seems to nullify --update

[Paul Gover]

> I'm  using rsync to update my local database snapshot from a remote pooled
> mirror server. The trouble is that the servers in the pool are sometimes
> out of date, so I only want to update when the files are newer than the
> local copies to avoid unnecessary I/O..
> ...

I've found a workaround by using hard links.  Instead of:
	cp -r <current> <new>
	rsync --update, <mirror> <new>
	mv <new> <current>
I now:
	mkdir <new>
	ln -f <current>/* <new>
	rsync --update, <mirror> <new>
	if [ <new>.<stuff> -nt <current>.<stuff> ]
	then mv <current> <old> ; mv <new> <current>
	else rm -r <new>
	fi
Since the files in <new> are the same as in <current>, --update does its job properly.
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