Added OS/X settings to setup.cfg

I have no idea how include and lib directories are supposed to work on
OS/X now, so I've punted and added the include_dirs setting to setup.cfg
Invalid parameter values passed in, due to size mismatch.
Merge pull request #21 from maparent/id_64bits

Invalid parameter values passed in, due to size mismatch.
Add SQL_WCHART_CONVERT to 64-bit Unix with 32-bit Unicode

Thanks to Marc-Antoine Parent.