Log Message:
Update xmame/xmess to 0.100

Changelog:
- Everything from MAME 0.100 (http://x.mame.net/changes-mame.html) and
  MESS 0.100 (http://x.mame.net/changes-mess.html).
- Improved support for OpenBSD, including fixing audio on 8-bit sound
  cards.  (Claudio Castiglia)
- Improved the SDL joystick driver so that it will work better with
  components identified as hat switches or trackballs.  (Dave Ahlswede)
- Increased the maximum number of joystick axes from 8 to 16 to support
  the Gravis Xterminator joypad.  (Dave Ahlswede)