* acconfig.h, configure.in: Detect Xsun xinerama and Xdmcp on Solaris. Patch
  by Brian Cameron (Brian.Cameron@Sun.COM)
* config/gdm.conf.in: set Xserver paths correctly for both XFree86 and Xsun
  Patch by Brian Cameron (Brian.Cameron@Sun.COM)
* daemon/slave.c, gui/Makefile.am gui/gdmwm.c: added Xinerama support for
  Solaris/Xsun platforms.