In Snow Leopard "platform.machine()" returns "i386" while
"platform.architecture()" returns ('64bit',''). Using information from both
we can determine the proper architecture
This reverts commit ea29e137b5 re-enabling the
64bit build on Macintosh.
I don't have access to this OS to fix the issue properly, so for the moment
I'm reverting back to 32bit build on Darwin. We changed to native 64bit in
8ddf930901.
Thanks to Johan Dahlberg and Tim Caswell for reporting and debugging this.
Ryan Dahl
Jeff Smick