FIX: Fixes

@rougier this was (just about) the minimum required to get `gl-agg` running on my OSX laptop. I tried installing it on Ubuntu earlier today (before making these changes) and that didn't work either, I can see if these changes fix that, too.

Closes #1.
I had to delete the 32-bit variants of each of these. I can check to see if they're available in Ubuntu, but they weren't on OSX (NVIDIA graphics in a 2011 macbook air).