build packages. This addresses the problems Sonja reported which
resulted from building in the same tree nfs'd from multiple platforms
simultaneously. Also removed -$(MACH) and ROOT-$OBJDIR changes that
failed to address this problem.
git-svn-id: svn://10.0.0.236/trunk@134011 18797224-902f-48f8-a5cc-f745e15eee43