Log Message:
Update xmame to 0.90.

Changes since 0.89:
- Everything from MAME 0.90 (http://x.mame.net/changes-mame.html) and
  MESS 0.90 (http://x.mame.net/changes-mess.html).
- The "-sleepidle (-si)" option is now enabled by default.  This keeps
  the emulation from hogging the CPU when it's idle.
- Did a major rework of the effects code, which now borrows code from
  the AdvanceMAME project (Hans de Goede):
  * The code is much cleaner.
  * Effects are much faster on DGA.
  * The scaling is no longer fixed to a certain factor for each
    effect: It supports normal (1x1 - 8x8), scale2x (2x2 - 3x6), scan2
    (1x2 - 4x2), rgbscan (1x3 - 6x3), scan3 (1x3 - 6x3), hq2x (2x2),
    lq2x (2x2), 6tap2x (2x2).
  * All the scanline effects come in both horizontal and vertical
    varieties, and vertical scanlines are automatically chosen for
    rotated games.
- Made the 32bpp to yuy2 blitting code much faster and cleaner.  (Hans
  de Goede)
- Enhanced LIRC support to compile and link against system-installed
  liblirc_client files.  Added the "-lircrc" option.  (Mads Villadsen)
- Optimized some of the yuy2 blit functions.  (Hans de Goede)
- Added CPU capability detection for Linux on x86.  Currently this only
  tests for MMX.  (Hans de Goede)
- Changed the effects code to use the C versions of effects when a CPU
  isn't MMX-capable.  This means that binary distributions can be built
  with EFFECT_MMX_ASM defined and still run on older CPUs.  This
  presently only works for Linux on x86.  (Hans de Goede)
- Fixed "-geometry (-geo)" to properly adhere to given window
  coordinates.  Added support for window coordinates to OpenGL.  (Hans
  de Goede)
- By default, fullscreen mode now only spans screen 0.  To select
  another screen, use "-xinerama-screen <nr>", or use -1 if you want
  the old behavior where all screens are spanned.  (Joe Q. and Hans de
  Goede)
- Removed Mesa on Glide on Voodoo 2 in fullscreen mode hack.  If you
  need this, just use "-geometry 640x480 -grabkeyboard -grabmouse"
  instead.  (Hans de Goede)
- Reverted to treating lightgun buttons as mouse buttons, so lightguns
  will work independent of joystick devices or drivers.  It is now
  also assumed that there are always 5 mice connected, so multiple
  lightguns should work fine.
- The old-style debugger works again.  (Hans de Goede)
- Merged several of Nicola Salmoria's memory leak fixes from Windows
  MAME.
- Fixed multiple port recording for the playback/record option.  (Chad
  Hurwitz)