Offer to beta test ports with potential 32 bit Intel Core Duo issues.

[Steve Morris]

> FYI the iPhone OS 4 beta 1 and 2 SDKs have already been shown to cause problems building several ports, as such we can't support using MacPorts with them. (We've already been closing tickets filed as such as invalid.)
>

I guess this limits the usefulness of my offer. However since problems
with a Beta SDK may indicate problem that will still exist in a future
non Beta version is closing such tickets as invalid the best solution?
They may provide valuable documentation and save development time
later.