Now using SQLite3 3.8.5 for Windows builds

I've updated the version information to 3.8.5 and confirmed that it's correct. I can't, however, confirm that installing the gem will work now because I have no idea how to test this. I'm assuming I need to cross compile and I wouldn't know where to start.

Issue: https://github.com/sparklemotion/sqlite3-ruby/issues/134