Adjust export list for 64-bit systems

[Benjamin Kosnik]

>In 3.3, we used a wider glob pattern that matched all of this.
>In 3.4, the chosen globbing only matches 32-bit systems.
>Since we only have globbing, not full regexps, I think this is
>the best we can do.

Thanks for fixing this up.

>What's the correct procedure for updating the abi files?  They
>seem to be well out of date for alpha...

The check-abi rule only really makes sense for a release branch with a
baseline abi. Mainline has explicitly broken the 3.2.0 ABI, and not
finalized on a new one, so check-abi on mainline is really for
educational purposes only (ie, to see what changed.)

best,
benjamin