Log Message:
Update to 1.2a4. Changes are approximately:

- merged in a patch with improves mp3 recognision using mp3tech.
- Updated the build_dpkg.sh file.
- libusb is now the default method to connect to the rio
- You can still use the old default driver with the option --without-libusb.
- Small updates to mp3.c to try to improve mp3 recognision.
- Small improvement in my english skills (fixed spelling probs). english
  is my only language and i can't spell!
  - On a subnote, I updated the README a bit (though not much of it is
    spelling).
- Implemented a solution to lost song bug. It needs testing!
- Fixed glaring bugs in driver_macosx.c.
- Fixed my implementaion of basename.

pkgsrc changes:

- use canonical pkgsrc config.guess and config.sub
- we no longer care about pre-1.6 -current systems