Index Broken on 10.5

[Joshua Root]

This is probably as good a place as any to also point out that if you
run an older system and would like MacPorts to keep working on it, it is
in your interest to test the betas. We don't have CI resources for
anything older than 10.6, and very few people even have a 10.4 or 10.5
system.

It's pretty clear that nobody tested the 2.6 beta on anything that old
(or if they did, they didn't file tickets for the issues), and while I
don't blame anyone for that, it does make it virtually inevitable that
the final release will ship with bugs affecting only those older OS
versions.

- Josh