Log Message:
Update xmame to 0.79.1

Changes since 0.78.1 includes:
- Everything from MAME 0.79 (http://x.mame.net/changes-mame.html) and
  MESS 0.79 (http://x.mame.net/changes-mess.html).
- Updated the ALSA DSP module to use the ALSA 1.0 API.  (Shyouzou
  Sugitani)
- Paths now allow a literal "$" if it's preceded by "\".  (Andre
  Majorel)
- Fixed a segfault that occurred when "-debug" was used with a rotated
  game.
- The debugger window should no longer be blank for 32bpp games.
- Fixed a bug in fix-comments.c that was causing it to mangle
  src/drivers/vendetta.c.
- When XINPUT is defined in the makefile but no XInput devices are
  configured, the mouse is treated as a trackball.  (Gerd Sussner)
- The Xv YUV code should now work on big-endian platforms.  (Maciej J.
  Woloszyk)
- The trigger for the ACT LABS TV light gun now works; reloading now
  requires only one offscreen shot instead of two.  (Joe)