Don't install BACKBUG[S5].BAT, backbug[s5] nor config.guess
OpenBUGS is a command line interface so there is no longer a 
need for these batch BUGS scripts (which utilized config.guess)


git-svn-id: https://svn.r-project.org/ESS/trunk@5546 0bbaf3bd-34e0-0310-bf65-c717079852d4